**Q4: **

Charlotte is adding 15, 8, and 28.

She added the ones first.

Add the tens to finish her work and find the total.

**Q5: **

Find the sum.

*Hint*: Add the ones then the tens.

**Q6: **

Olivia spilled ink on her homework.

Find the covered numbers.

**Q7: **

What is the missing number?

- A10
- B30
- C20

**Q8: **

Add 54 and 40.

**Q9: **

How many tens are there altogether?

**Q10: **

Find the sum.

*Hint*: Add the ones then the tens.

**Q11: **

Add to find the total.

*Hint*: Think about tens and ones. Use base ten blocks to help you.

.

.

**Q12: **

How many tens are there altogether?

**Q13: **

Find the sum.

*Hint*: Think about what happens when there are more than 10 ones.

**Q14: **

Find the sum.

*Hint*: Add the ones then the tens. What do you do if you have more than 10 ones?

**Q15: **

Add to find the total.

.

.

**Q16: **

Elizabeth is adding tens.

Find the missing numbers.

3 tens plus 4 tens is tens.

.

**Q17: **

Find the sum.

*Hint*: Add the ones then the tens. What happens when there are more than 10 ones?

**Q18: **

Complete the following: , , .

- A3, 3 tens, 30
- B4, 4 tens, 40
- C3, 3 tens, 10
- D7, 7 tens, 70

**Q19: **

Complete the following: , , .

- A7, 7 tens, 70
- B2, 2 tens, 20
- C5, 5 tens, 50
- D9, 9 tens, 90

**Q20: **

Write the missing number: .

**Q21: **

James is using base ten blocks to help him add 9 to 34.

He adds the ones first. There are 13 ones.

Pick the model that shows what he should do.

- A
- B
- C

Find the sum.

**Q22: **

Daniel spilt ink on his homework.

Help him find the covered numbers.

**Q23: **

Pick a model that shows the sum.

*Hint*: Think about what happens when there are more than 10 ones.

- A
- B
- C

**Q24: **

Amelia has 20 beads. She wants to add on 10 more. How many will she have altogether?

**Q25: **

Find the sum.

*Hint*: Add the ones then the tens.