Step 2 / 3
Sum of two numbers
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Write as a sum · Numbers & Operations
Write a number as the sum of two numbers, like 16 = 10 + 6.
This is step 2 of unit 17, “Write as a sum”, 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.