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.
Ans:
| Counting | Missing Number |
|---|---|
| 211, 212, ___, ___, 216 | 213, 214, 215 |
| 227, ___, 230 | 228, 229 |
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.
| Number | What to do | Answer |
|---|---|---|
| 285 | Increase by 1 | ___ |
| 147 | Increase by 10 | ___ |
| 289 | Decrease by 10 | ___ |
Ans:
| Number | What to do | Answer |
|---|---|---|
| 285 | Increase by 1 | 286 |
| 147 | Increase by 10 | 157 |
| 289 | Decrease by 10 | 279 |
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.