# Lesson Worksheet: Adding Three Numbers Mathematics • 1st Grade

In this worksheet, we will practice adding three 1-digit numbers by adding in any order and using strategies like making ten or using doubles.

**Q1: **

Complete the following: .

**Q2: **

Find the three numbers from 4, 1, 7, 9, and 2 whose sum is 10.

- A7, 2, 1
- B4, 2, 1
- C4, 2, 9
- D7, 2, 9

**Q3: **

.

**Q4: **

Find the missing number in .

Using that , what is ?

**Q5: **

Find the missing number in .

**Q6: **

We will see how we can write in different ways.

Find the missing number.

Find the missing number.

Complete the missing sum.

- A7, 3
- B7, 6
- C4, 9
- D11, 3
- E4, 8

All of these sums are equal. What are they equal to?

**Q7: **

Scarlett has 20 counters.

Use the counters to find the missing number.

**Q8: **

When we add three numbers, we can first add any two of them.

For example, to find , we could first add 8 and 6 to get 14 as the picture shows.

Now, can you find the missing number?

**Q9: **

Am I using the equal sign correctly? Check if the two sums are equal.

- AYes
- BNo

**Q10: **

Am I using the equal sign correctly? Check if the two sums are equal.

- ANo
- BYes