Find the matching number sentence for the following: three plus one equals four, two plus two equals four, three plus one equals five, or three plus two equals five.
Let’s count this group of caterpillars first. How many can you count? There’s one, two, three. So we can write number three below the picture. Now we can count the number of caterpillars in the second group. There’s one.
Now we need to count the third group, which shows us how many caterpillars there are altogether: one, two, three, four. Three plus one equals four. The number sentence which matches the picture is three plus one equals four.