Understanding Addition and Decomposition

This video tutorial teaches how to add using tens and near tens. It begins with a review of decomposing numbers and explains the commutative property of addition. The lesson then covers building tens using various number combinations and demonstrates using a tens and ones chart for addition. Finally, it shows how to use near tens, like 9, to simplify addition problems.

What does it mean to decompose a number?

• To multiply it by ten

• To break it into smaller parts

• To divide it by two

• To add it to another number

Which property states that the order of addends does not change the sum?

• Identity Property

• Commutative Property

• Distributive Property

• Associative Property

Which of the following is NOT a way to make ten?

• 5 + 5

• 2 + 8

• 1 + 9

• 3 + 6

How many ones are there in the number fifteen?

• Fifteen

• Zero

• Ten

• Five

What is the sum of one ten and nine ones?

• Twenty

• Nineteen

• Ten

• Nine

If you have a ten rod and remove one block, how many blocks are left?

• Eight

• Seven

• Nine

• Ten

How can you decompose the number 5 to use it with a near ten like 9?

• Into 3 and 2

• Into 5 and 0

• Into 1 and 4

• Into 2 and 3

What is the result of adding nine and two using the decomposition method?

• Ten

• Eleven

• Twelve

• Thirteen

What is the sum of nine and five using the near tens method?

• Fifteen

• Sixteen

• Fourteen

• Thirteen

What is the main concept learned in this lesson?

• Subtracting by tens

• Multiplying by tens

• Adding by tens and near tens

• Dividing by tens