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Math Worksheets

Lessons for First Grade

Free Printable Worksheets

Printable Addition Strategy Worksheets for 1st Grade:

Add by Counting On

Counting On with Missing Addend

Adding Doubles (eg. 3 + 3)

Add using Addition Facts

Make 10 strategy, addend is 9 (eg. 9 + 6)

Make 10 strategy, addend is 8 (eg. 8 + 5)

Make 10 strategy, addend is 7,8,9

How to use the Counting On Strategy to find Missing Addend?

Counting-on can also be applied to find a missing addend in an addition problem.

- Understand the Concept:

Explain to students that counting-on can be used to find a missing addend by starting with one of the numbers and counting forward to the sum. - Identify the Known Addend and Sum:

Given an addition problem with a missing addend, identify the known addend and the sum. For example, in

6 + __ = 9, 6 is the known addend, and 9 is the sum. - Start with the Known Addend:

Start counting on from the known addend. In the example, start with 6. - Count On to the Sum:

Continue counting forward until you reach the sum. In the example, count on from 6: 7, 8, 9. So, the missing addend is 3.

Using counting on to find a missing addend is a practical application of this mental math strategy. It reinforces number sense and helps students develop a deeper understanding of addition concepts. Regular practice with such problems will strengthen their ability to use counting on efficiently.

Click on the following worksheet to get a printable pdf document.

Scroll down the page for more Counting On to find Missing Addend Worksheets.

Count on to add.

(These worksheets are printable files with answers on the second page.)

Counting On Missing Addend Worksheet #1

Counting On Missing Addend Worksheet #2

Counting-On Lesson

Counting-On to find missing Addend Lesson

Add One

Addition within 10 (eg. 3 + 5)

Addition within 20 (eg. 6 + 8)

Mixed Single Digit Addition

Missing Addend (sums < 10) (eg. __ + 5 = 7)

Missing Addend Word Problems (eg. 8 + __ = 17)

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