Breaking Apart Numbers to Add: Explaining Addition

This lesson teaches how to explain addition by breaking apart numbers. It covers using place value, blocks, and number lines to demonstrate addition strategies. Examples include adding vegetables and tomatoes, showing different methods to simplify addition. The lesson emphasizes the importance of explaining math to verify answers and help others understand.

Why is it important to explain our addition strategies?

• To avoid using numbers

• To make math more difficult

• To prove our answers are correct and help others understand

• To confuse other students

Which of the following is NOT a method to explain addition?

• Using place value

• Drawing pictures

• Ignoring the problem

• Using words

How can the number 23 be broken apart using place value?

• 20 plus 3

• 10 plus 13

• 15 plus 8

• 5 plus 18

In the vegetable problem, what was the first step the math monkey took using place value blocks?

• Broke apart 59

• Broke apart 23

• Added 10 to 59

• Subtracted 1 from 23

What was the final number of vegetables used in the salsa?

• 68

• 82

• 59

• 75

In the tomato problem, how did the first monkey simplify the addition?

• By adding 10 to 28

• By subtracting 5 from 47

• By breaking apart 47

• By breaking apart 28

What is the total number of tomatoes the cooks have?

• 82

• 28

• 75

• 47