## Addition Three 1-Digit Numbers

### Adding Three 1-Digit Numbers: Learn

Adding three numbers (for example 5 + 8 + 7) involves two steps.

• Mentally add the first two numbers. (5 + 8 = 13).
• Add the other number to this sum. (13 + 7 = 20).

All together, 5 + 8 + 7 = 20.

### Adding Three 1-Digit Numbers: Practice

#### What is the Sum of the three Numbers?

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