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Tens minus tens
★★★30 − 10: 3 − 1 = 2, so it is 20.
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Example
Solve it.
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Answer: 30
Two-digit subtraction · Numbers & Operations
Subtract the ones, then the tens. Solve no-borrow subtraction in columns too.
30 − 10: 3 − 1 = 2, so it is 20.
This is step 1 of unit 31, “Two-digit subtraction”, in Stage 2: Numbers to 100, carrying and borrowing (ages 7–8). A round has 10 problems; 90% or better earns three stars. Everything is free with no sign-up, and your stars and XP are saved on this device.