Step 1 / 4
Count backwards
★★★20, 19, 18, 17 … each number is 1 less.
Addition Village · Learn first
Example
What number goes in the box?
12, ▢, 10, 9, 8
Answer: 11
Counting backwards · Numbers & Operations
Count back from 20 to 1, find the number just before, and spot mistakes in a backwards row.
20, 19, 18, 17 … each number is 1 less.
This is step 1 of unit 6, “Counting backwards”, 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.