Make 100 Strategy Worksheets

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Printable “3-digit Addition” Worksheets:
Arrow Addition (eg. 450 + 360)
Make 100 Strategy (eg. 440 + 280)
3-digit + 3-digit (eg. 648 + 594)

Make 100 Strategy Worksheets

The “add by making a 100” method is a strategy for adding two-digit numbers that can result in easier mental math calculations.

Look for one of the numbers that is close to making a hundred with one of its digits.
Try to “borrow” from the other number to make a 100 or a multiple of 100.
Add to get the final sum.

Example:
97 + 68 can be calculated as 97 + 3 + 65 = 165
196 + 77 can be calculated as 196 + 4 + 73 = 273

Benefits of Adding by Making a 100:
Simplifies Calculations: By “shifting” one number closer to a hundred, you often end up with easier additions for the remaining digits.
Mental Math Friendly: This method often leads to smaller numbers to add in your head, making it ideal for mental math calculations.
Place Value Understanding: It reinforces the concept of place value by demonstrating how manipulation within and across place values affects the sum.

Have a look at this video, if you need to review how to use the make 100 strategy for addition.

Make a 100 Strategy for Addition

Click on the following worksheet to get a printable pdf document.
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More Make 100 Strategy Worksheets

(Answers on the second page.)
Make 100 Strategy Worksheet #1
Make 100 Strategy Worksheet #2
Make 100 Strategy Worksheet #3
Make 100 Strategy Worksheet #4
Make 100 Strategy Worksheet #5
Make 100 Strategy Worksheet #6 (sprint practice)
Make 100 Strategy Worksheet #7 (sprint practice)

Make 10 strategy (eg. 67 + 4)
Missing Addend (eg. __ + 7 = 15)
Missing Addend, Multiples of 10 (eg. 22 + __ = 30)

Add 3 numbers (make 10) (eg. 5 + 3 + 5)
Add 3 single digit numbers (eg. 4 + 7 + 8)

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