Text Book Solutions All Class

Q1: Without counting one by one, find the total number of pens. Write one multiplication sentence. Ans: There are 4 boxes with 5 pens in each box.
5 + 5 + 5 + 5 = 20
So, the multiplication sentence is 4 × 5 = 20 pens.

Q2: A student wrote 5 + 5 + 5 + 5 + 5 = 25 for the given picture. Is this correct? Write the correct repeated addition and multiplication sentence.Ans: This is not correct because 5 shows the number of bags, not the number of apples in each bag.
If each bag has 3 apples, the repeated addition is:
3 + 3 + 3 + 3 + 3 = 15
So, the correct multiplication sentence is 5 × 3 = 15.

Q3: Each decorative band needs 5 beads. How many beads are needed to make 9 such bands? Ans: One band uses 5 beads.
For 9 bands: 5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 = 45
So, the multiplication sentence is 9 × 5 = 45 beads.

Q4: If 28 biscuits are packed equally with 7 biscuits in each box, how many boxes will be needed? Ans: There are 28 biscuits in total.
28 ÷ 7 = 4
So, 4 boxes will be needed.

Q5: 20 mangoes are shared equally among 4 children. How many mangoes will each child get? Will any mangoes be left?Ans: 20 mangoes are shared among 4 children.
20 ÷ 4 = 5
Each child will get 5 mangoes and no mango will be left.

Q6: The items in the picture are meant to be shared equally. Is the sharing correct? Give one reason. 
Ans: No, the sharing is not correct.
This is because all the plates do not have the same number of items, so the sharing is not equal.

Q7: Four children are sitting in each row. There are 6 such rows. How many children are there in total? Write one multiplication sentence. 
Ans: There are 6 rows and each row has 4 children.
So, repeated addition is 4 + 4 + 4 + 4 + 4 + 4 = 24.
The multiplication sentence is 6 × 4 = 24 children.

Q8: Complete the number pattern and name the multiplication table it belongs to.Ans: The completed pattern is 5, 10, 15, 20, 25.
This pattern belongs to the 5 times table.

Q9: There are 32 legs in total. How many stools are there? Which operation will you use?Ans: Each stool has 4 legs.
32 ÷ 4 = 8
So, there are 8 stools.
Division is used because the total number of legs is divided into equal groups of 4.

Q10: Rina says that 6 × 4 and 4 × 6 give the same answer. Is she correct? Explain your answer.
Ans: Yes, Rina is correct.
6 × 4 means 6 groups of 4 and 4 × 6 means 4 groups of 6.
Both give the same total, which is 24.

Q1: Look at the rows of triangular torans. Each row has 50 triangles. How many triangles are there in 5 rows?
Ans: In 1 row there are 50 triangles. In 5 rows, there are 50 × 5 = 250 triangles.

Q2: There are 200 bangles and 80 more bangles. Write the total number of bangles.
Ans: 200 bangles and 80 more make 280 bangles.

Q3: Jojo has 298 toffees. He gets 2 more. Write how he reaches 300 step by step.
Ans: 298 + 1 = 299 and 299 + 1 = 300. So, Jojo has 300 toffees.

Q4: Fill in the missing numbers while counting.
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Q5: Write the number sentence for 235 in two different ways.
Ans: 235 can be written as 200 + 35 and also as 250 − 15.

Q6: Why is counting in tens easier than counting one by one for big numbers?
Ans: Counting in tens is quicker and helps us count large numbers correctly.

Q7: Increase or decrease the numbers as given.

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Q8: Look at the number 321 and 231. Which number is bigger? Write the reason.
Ans: 321 is bigger because it has 3 hundreds and 231 has only 2 hundreds.

Q9: Compare using >, < or = : 
285 ____ 275
199 ____ 201
Ans: 285 > 275
199 < 201

Q10: Make 3-digit numbers using digits 3, 2 and 4 without repeating any digit. Write the greatest number.
Ans: The greatest number that can be made is 432.

Q1: Name any four shapes that you can see in a rangoli design.
Ans: Some shapes seen in a rangoli design are circle, square, triangle and rectangle.

Q2: Look at the rangoli carefully. Which shapes are made using only straight lines and Curved lines?

Ans: Squares and triangles are made using only straight lines. Circles are made using only curved lines.

Q3: Look at the objects around you. Write the names of two objects that have rectangular faces.
Ans: A book and a box have rectangular faces.

Q4: Write the number of sides and corners of each shape.

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Q5: Look at a square and a rectangle. What is common between a square and a rectangle?Ans: Both have four sides, four corners and all their corners are square corners.

Q6:  Look at a square and a rectangle. How is a square different from a rectangle?
Ans: In a square, all sides are equal in length. In a rectangle, only the opposite sides are equal.

Q7: How many sides and corners does a square have?
Ans: A square has 4 sides and 4 corners.

Q8: Look at a triangle and tell how many sides and corners does a triangle have?
Ans: A triangle has 3 sides and 3 corners.

Q9: What is a square corner?
Ans: A square corner is a corner where two straight lines meet to make a right angle.

Q10: Look at the given shapes. Each shape can be the odd one out. Explain how each shape is different.
Ans: Each shape can be odd for a different reason. 
The circle is odd because it has no corners. 
The triangle is odd because it has only three sides. 
The square is odd because all its sides are equal. 
The rectangle is odd because only its opposite sides are equal.

Q1: If the total number of objects is 15 and 12 objects are visible, how many objects are hidden?
Ans: Number of hidden objects = 15 − 12 = 3.

Q2: Find the number of hidden objects in each case.

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Q3: Add the following numbers.

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Q4: Subtract the smaller number from the larger number.

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Q5: Fill in the table to make 100.

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Q6: How many jumps of 10 are needed to go from 22 to 52?
Ans: From 22 to 52 is a difference of 30. So, 3 jumps of 10 are needed.

Q7: Who has more stamps: A has 52 stamps, and B has 37 stamps. How many more does A have?
Ans: 52 − 37 = 15. 
A has 15 more stamps.

Q8: Start at 7 on a number line and jump forward by 10 two times. Write the numbers you land on.
Ans: The numbers are 17 and 27.

Q9: Decide without calculating exactly: Will 68 − 26 be more than or less than 50?
Ans: 68 − 26 = 42, which is less than 50. So, the answer is less than 50.

Q10: Estimate and say whether the answer is more than or less than 100: 85 + 67.
Ans: The answer is more than 100 because 80 + 60 = 140.

Q1: What is 100? Write two ways to show 100.
Ans: 100 means one hundred. For example It can be shown as 10 bundles of 10 sticks or as 100 loose objects.

Q2: How many tens are there in 100?
Ans: There are 10 tens in 100.

Q3: Write the next number for each.

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Q4: Write two different ways to make 100.
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Q5: Fill in the blanks to make 100.
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Q6: Write the numbers from 101 to 105 in figures and words.
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Q7: Write the number made by 1 bundle of 100, 2 tens and 3 ones.
Ans: 1 hundred, 2 tens and 3 ones make the number 123.

Q8: Write one more and one less than each number.

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Q9: Arrange the numbers in increasing order: 158, 150, 163.
Ans: 150, 158, 163.

Q10: Mark the numbers 110, 135 and 180 on a number line.
Ans: The numbers 110, 135 and 180 are placed correctly between 100 and 200 on the number line according to their values.

Q1: Name any four 3D shapes.
Ans: Four 3D shapes are cube, cuboid, cone and cylinder.

Q2: Write the name of the shape of each object.
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Q3: Which 3D shape has no edges and no corners?
Ans: A sphere has no edges and no corners.

Q4: Which 3D shapes have only flat faces?
Ans: Cube and cuboid have only flat faces.

Q5: Which 3D shapes have curved faces?
Ans: Cone, cylinder and sphere have curved faces.

Q6: Count the faces, edges and corners of a cube.
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Note: Corners are also known as vertices.

Q7: A cone is placed on a cylinder, and the cylinder is placed on a cuboid. Write the position of each shape.
Ans: The cone is on top.
The cylinder is in the middle. 
The cuboid is at the bottom.

Q8: Name one 3D shape that is found the most in a classroom.
Ans: Cuboid is found the most because desks, books and cupboards are cuboid-shaped.

Q9: Look at a dice. What number is on the face opposite to 1?
Ans: The number opposite to 1 is 6 because the sum of opposite faces always equals 7 (1+6=7, 2+5=7, 3+4=7).

Q10: Join three cubes. Write the different shapes that can be made.
Ans: Three cubes can be joined to make a cuboid.

Q1: How does making marks help while counting objects?
Ans: Making marks helps us count each object one by one. It ensures that no object is missed or counted more than once.

Q2: Why do we group objects while learning mathematics?
Ans: We group objects to understand them better by their common features. Grouping also makes counting and learning easier.

Q3: How can counting letters help us decide which name is longer? Explain with one example.
Ans: By counting the letters in each name, we can compare them. For example, “Elephant” is longer than “Ox” because it has more letters.

Q4: Write the names of five classmates. Find the longest and the shortest name.
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Conclusion: Priyanka is the longest name. Riya and Amit are the shortest names.

Q5: Write the starting letters of your classmates’ names. Which starting letter is used the most?
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Conclusion: The letter R is used the most.

Q6: Write the number name of 56. How many letters does it have?
Ans: The number name of 56 is fifty-six. It has eight letters.

Q7: Find a number between 1 and 99 whose number name has two words and is close to 100. Write its number name.
Ans: The number is 99. Its number name is ninety-nine.

Q8: From the numbers 63 to 78, which number has the shortest number name?
Ans: Sixty-six has the shortest number name among these numbers.

Q9: Write the number names of 45, 58 and 62. Arrange these numbers in order from the shortest number name to the longest number name.
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Order: 62, 45, 58

Reason: The numbers are arranged by comparing the number of letters in their number names.

Q10: Make a table to show different hairstyles in your class. Which hairstyle is the most common?
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Conclusion: Short hair is the most common hairstyle in the class.