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Minus zero, minus itself
★★★15 − 0 = 15 and 15 − 15 = 0.
Addition Village · Learn first
Example
Solve it.
15 − 0 = ?
Answer: 15
Subtracting zero · Numbers & Operations
Subtracting zero changes nothing; subtracting the same number leaves zero.
15 − 0 = 15 and 15 − 15 = 0.
This is step 1 of unit 27, “Subtracting zero”, 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.