Decomposing Numbers and Addition

This video tutorial teaches how to add more than two two-digit numbers by using decomposition. It explains the concept of decomposition, where numbers are broken down into tens and ones, and highlights the commutative property of addition, which states that the order of addends does not affect the sum. The tutorial includes practical examples, such as adding jelly beans and calculating the total distance of a bike trip, to demonstrate the method. By the end of the lesson, viewers will understand how to effectively add multiple numbers using decomposition.

What is the process of breaking down a number into smaller parts called?

• Multiplying

• Subtracting

• Decomposing

• Commutative property

Which of the following statements is true about the commutative property of addition?

• The order of addends changes the sum.

• The sum is always zero.

• The order of addends does not change the sum.

• Addition is not commutative.

If James ate 18, 24, and 36 jelly beans, how many did he eat in total?

• 78

• 68

• 98

• 88

How do you decompose the number 36 into tens and ones?

• 10 and 26

• 30 and 6

• 36 and 0

• 20 and 16

What is the sum of the tens when decomposing 18, 24, and 36?

• 60

• 50

• 80

• 70

How many miles did Stephanie ride in total during her bike trip?

• 50

• 45

• 60

• 55

What is the sum of the ones when decomposing 15, 23, and 17?

• 10

• 12

• 15

• 18

Which of the following is a correct decomposition of the number 23?

• 20 and 3

• 10 and 13

• 23 and 0

• 15 and 8

What is the first step in decomposing numbers for addition?

• Decompose into tens and ones

• Decompose into hundreds and thousands

• Subtract the numbers

• Add all numbers directly

What did you learn in this lesson about adding numbers?

• How to subtract numbers

• How to multiply numbers

• How to add more than two two-digit numbers by decomposing

• How to divide numbers