Worksheet: Addition of Three Numbers within 20 by Making Ten

In this worksheet, we will practice adding three numbers whose sum is at most 20 by finding two of them that sum to ten.

Q1:

Answer the questions to find an easy way to add 6 + 7 + 3 .

What is 7 + 3 ?

What is 6 + 1 0 ?

What is 6 + 7 + 3 ?

Q2:

Fady started putting counters into ten frames to help him add.

Can you find the total?

Q3:

We can add three numbers in any order.

Which of these is equal to the sum of 5, 9, and 1?

  • A
  • B
  • C

What is 5+9+1?

Q4:

Fill in the blank: 6 + + 3 = 6 + 1 0 6 .

Q5:

Add the numbers.

Find the ten frames that show the sum.

  • A
  • B
  • C

Q6:

Add by making 10.

Q7:

Rania started putting counters into ten frames to help her add.

What is the total?

Q8:

Add the numbers.

Hint: Can you find a way to make 10?

Q9:

Adding 3 numbers is easy when we can make 10!

To find 8 + 7 + 2 we can make 10 by adding 8 and 2 first.

What number is missing ?

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