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