Mental Math Strategies

2 | Addition by place value

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Example
Practice Problems

Introduction

We can add larger numbers quickly by breaking them into parts, then adding the parts to find the original sum.


Step by step | Addition by place value

  1. Break each addend into tens and ones.
  2. Add the tens. Remember this sum.
  3. Add the ones. Add this sum to the earlier sum to find the original sum.

Example | Addition by place value

Q: 34 + 58

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A: First, we break the addends into groups of tens and ones:
34 = 30 + 4
58 = 50 + 8
Next, we add the tens and ones:
30 + 50 = 80
4 + 8 = 12
Finally, we add these sums to find the original sum:
80 + 12 = 92
Thus, 34 + 58 = 92.

Practice | Addition by place value

Click "Create Report" upon completion of any practice set to document your progress: Example