Bar Model — 10 + 10 = 20 — free printable diagram

What is 10 + 10?

This part-whole bar model shows 10 and 10 as the two parts of one whole. Adding the parts gives the whole, so 10 + 10 = 20.

First part

10

Second part

10

Whole

20

Addition

10 + 10 = 20

Subtraction

20 − 10 = 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 10 and 10, and together they fill the whole bar of 20.
• Both parts are the same size, so this is a doubling fact: double 10 is 20.
• Reading it backwards gives the matching halving fact: 20 split into two equal parts is 10 each, so 20 ÷ 2 = 10.
• That is the fact family for these three numbers — the model is the reason 10, 10 and 20 belong together, whichever way round you write them.