**Related Pages**

Math Worksheets

Lessons for Second Grade

Free Printable Worksheets

Printable “3-digit Addition” Worksheets:

Arrow Addition (eg. 450 + 360)

Make 100 Strategy (eg. 440 + 280)

3-digit + 3-digit (eg. 648 + 594)

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.

Click on the following worksheet to get a printable pdf document.

Scroll down the page for 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)

Try the free Mathway calculator and
problem solver below to practice various math topics. Try the given examples, or type in your own
problem and check your answer with the step-by-step explanations.

We welcome your feedback, comments and questions about this site or page. Please submit your feedback or enquiries via our Feedback page.