Bar Model — 8 + 10 = 18 — free printable diagram

What is 8 + 10?

This part-whole bar model shows 8 and 10 as the two parts of one whole. Adding the parts gives the whole, so 8 + 10 = 18.

First part

8

Second part

10

Whole

18

Addition

8 + 10 = 18

Subtraction

18 − 8 = 10

• A part-whole bar model shows the whole on one bar and the parts that make it on the bar underneath. Here the two parts are 8 and 10, and together they fill the whole bar of 18.
• The parts can be added in either order — swapping them does not change the whole: 8 + 10 = 10 + 8 = 18.
• Covering up one part turns the same picture into a subtraction: 18 − 8 = 10 and 18 − 10 = 8.
• That is the fact family for these three numbers — the model is the reason 8, 10 and 18 belong together, whichever way round you write them.