Missing addend - Rectangle

Sum up to

Theme

🍫 Eat chocolate-bar together!

Imagine the rectangle was a chocolate-bar you and mom shared.

Can you figure out how many pieces Mom ate?

There are 10 pieces.

You ate 5 pieces.

5+00=10

There are 6 pieces.

You ate 2 pieces.

2+00=6

There are 14 pieces.

You ate 7 pieces.

7+00=14

There are 4 pieces.

You ate 2 pieces.

2+00=4

There are 7 pieces.

You ate 3 pieces.

3+00=7

There are 3 pieces.

You ate 2 pieces.

2+00=3

There are 15 pieces.

You ate 9 pieces.

9+00=15

There are 13 pieces.

You ate 8 pieces.

8+00=13

There are 12 pieces.

You ate 3 pieces.

3+00=12

There are 4 pieces.

You ate 3 pieces.

3+00=4

There are 2 pieces.

You ate 2 pieces.

2+00=2

There are 19 pieces.

You ate 17 pieces.

17+00=19

There are 20 pieces.

You ate 10 pieces.

10+00=20

There are 10 pieces.

You ate 8 pieces.

8+00=10

There are 4 pieces.

You ate 2 pieces.

2+00=4

What is this?

[Rectangle version] "Missing Addend" is a fun and interactive math activity for kids. Given one addend and the sum, kids will figure out the other addend. A great way to build addition skills and number sense!

Hints:

Help kids understand the relationship between rectangles and numbers.
Then from the relationship to math addition.
Let kids write the math equation down!
Have fun! Keep kids busy!