Topic 5 Review

Topic 5 Review

Hundreds Chart to Subtract

• Start at the Largest number

• Use the second number to show you how many times to move up and how many times to move backwards

• Tens = Hop up

• Ones = Backwards

• Ex: 87-39=

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Expanded Form

• Break up the numbers into tens and ones

• How much are the tens WORTH?

• How many ones?

• Ex: 46= __ + __

Multiple Choice

Which is the expanded form of 78?

• 7 + 8

• 70 + 80

• 7 + 80

• 70 + 8

Subtract Using Expanded Form

• Expand each number

• Solve the subtraction equation for the ONES

• Solve the subtraction equation for the TENS

• Squish the answer back into standard form

• EX: 64-12

Word Problems

• What are the important numbers?

• Do we add of subtract?

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