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Teen minus a digit
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Teen minus a digit · Numbers & Operations
If you know 6 − 4 = 2, you know 16 − 4 = 12. Subtract the ones and keep the ten.
This is step 3 of unit 25, “Teen minus a digit”, 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.