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Additions and subtractions up to 100

Additions and subtractions are more difficult with two-digit numbers.

Learn how **additions and subtractions in column** work.

Discover how to do **additions uo to 100 using the abacus**.

Learn how to do **additions and subtractions in column**.

Discover the **addends**, the **sum**, the **minuend**, the **subtrahend** and the **subtraction**.

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Table of contents of this lesson: Additions and subtractions up to 100

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Learn FREE with videos and interactive exercises

## Forward and backward on the number line

It's not easy to do **additions and subtractions** with larger numbers.

To calculate 8 + 7, let's think that 8 needs 2 units to arrive to 10. Then you add the other 5 units. The result is 15.

To calculate 16 - 7, let's start from 16 and subtract 6 units to arrive to 10 and then subtract another unit to arrive to 7. The result is 9.