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.
| Total Objects | Visible Objects | Hidden Objects |
|---|---|---|
| 17 | 10 | __ |
| 20 | 9 | __ |
| 27 | 12 | __ |
Ans:
| Total Objects | Visible Objects | Hidden Objects |
|---|---|---|
| 17 | 10 | 7 |
| 20 | 9 | 11 |
| 27 | 12 | 15 |
Q3: Add the following numbers.
| Addition | Answer |
|---|---|
| 7 + 5 | __ |
| 9 + 7 | __ |
Ans:
| Addition | Answer |
|---|---|
| 7 + 5 | 12 |
| 9 + 7 | 16 |
Q4: Subtract the smaller number from the larger number.
| Subtraction | Answer |
|---|---|
| 7 − 5 | __ |
| 18 − 9 | __ |
Ans:
| Subtraction | Answer |
|---|---|
| 7 − 5 | 2 |
| 18 − 9 | 9 |
Q5: Fill in the table to make 100.
| Number Sentence | Answer |
|---|---|
| 60 + ___ = 100 | __ |
| ___ + 25 = 100 | __ |
| ___ + 85 = 100 | __ |
Ans:
| Number Sentence | Answer |
|---|---|
| 60 + ___ = 100 | 40 |
| ___ + 25 = 100 | 75 |
| ___ + 85 = 100 | 15 |
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.