Bar Model — 1 + 4 = 5 — free printable diagram

What is 1 + 4?

This part-whole bar model shows 1 and 4 as the two parts of one whole. Adding the parts gives the whole, so 1 + 4 = 5.

First part

1

Second part

4

Whole

5

Addition

1 + 4 = 5

Subtraction

5 − 1 = 4

• 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 1 and 4, and together they fill the whole bar of 5.
• The parts can be added in either order — swapping them does not change the whole: 1 + 4 = 4 + 1 = 5.
• Covering up one part turns the same picture into a subtraction: 5 − 1 = 4 and 5 − 4 = 1.
• That is the fact family for these three numbers — the model is the reason 1, 4 and 5 belong together, whichever way round you write them.