The ideas in this addition lesson are taken from Addition 1 ebook. Only a few examples of each problem type are shown; you should make more problems of each kind for the student.

Missing addend problems
Free lesson plan from Homeschool Math.net

This lesson gives you ideas how to introduce the concept of missing addend during first grade math, or even in kindergarten - while children are studying their basic addition facts with sums less than 10.

1. Missing items. How many more do you have to add? Write the addition sentence.

I have 2 bulbs, but I need 5 total.

__ + __ = __

I have 3 carrots but I need 7.

__ + __ = __

I have 5 blocks but I need 10.

__ + __ = __

I have 4 carrots, but I need 6 total.

__ + __ = __

I have 1 block but I need 3.

__ + __ = __

I have 3 bulbs but I need 4.

__ + __ = __

2. How much more is needed? Draw more 'I' marks to the pictures so you have the total as shown by the sum (answer).

I I

__ + __ = 5

I I

__ + __ = 6

I I I I I

__ + __ = 7

I I I I I I I

__ + __ = 10

I I 2 + __ = 5 2 and what number make 5?	I I I I I I I 7 + __ = 8 7 and what number make 8?	I I I 3 + __ = 6 3 and what number make 6?
I I I I I I I I I 9 + __ = 10	I I I 3 + __ = 4	I 1 + __ = 5

3. How much is missing? Draw first as many I marks as shown by the first number in the problem. How many more do you need to draw?

I I I I I

5 + __ = 9

7 + __ = 10

3 + __ = 7

4 + __ = 8

4. How much is missing from 6? How much is missing from 5?

You need six total Draw more sticks.

1 + __ = 6	I
2 + __ = 6	I I
3 + __ = 6	I I I
4 + __ = 6	I I I I
5 + __ = 6	I I I I I
6 + __ = 6	I I I I I I

You need five total Draw more sticks.

1 + __ = 5	I
2 + __ = 5	I I
3 + __ = 5	I I I
4 + __ = 5	I I I I
5 + __ = 5	I I I I I

5. What kind of numbers together make ten? Write down here addition sentences - as many different ones as you can - so that the sum is ten.

6. How much is missing? Notice the patterns.

1 + __ = 10

2 + __ = 10

3 + __ = 10

4 + __ = 10

5 + __ = 10

6 + __ = 10

7 + __ = 10

8 + __ = 10

9 + __ = 10

10 + __ = 10

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Missing addend problems Free lesson plan from Homeschool Math.net

HOMESCHOOL MATH NEWSLETTER

Missing addend problems
Free lesson plan from Homeschool Math.net