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: 1+5+4=.

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:

3+5+1=.

Q4:

Find the missing number in 16+3+1=+1.

Using that 16+3+1=19+1, what is 16+3+1?

Q5:

Find the missing number in 13+4+7=+7.

Q6:

We will see how we can write 4+6+3 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 8+6+7, 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

Practice Means Progress

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