Step 1 / 3
Swap the numbers
★★★5 + 12 = 17 and 12 + 5 = 17.
Addition Village · Learn first
Example
What number goes in the box?
8 + 11 = 11 +
Answer: 8
Swap and add · Numbers & Operations
5 + 12 and 12 + 5 have the same sum. Swapping the numbers does not change the answer.
5 + 12 = 17 and 12 + 5 = 17.
This is step 1 of unit 22, “Swap and add”, in Stage 1: Numbers to 20, adding and subtracting (ages 6–7). A round has 8 problems; 90% or better earns three stars. Everything is free with no sign-up, and your stars and XP are saved on this device.