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Subtract 10 from a number

Subtracting 10 removes one group of ten from a whole number, leaving the ones value unchanged while reducing the tens value by one when no regrouping is needed. Within nonnegative numbers to 1,000, this relationship can be represented on a number line or through place value, including boundary cases such as 100−10=90100-10=90; it builds mental fluency with place-value changes and prepares for broader addition and subtraction.

Detailed Explanation: Subtract 10 from a number

To subtract (10)(10), take away one group of ten. The ones digit stays the same, and the tens digit becomes one less.

Example: (47−10)(47-10)

  1. Look at the tens and ones:
    • (47)(47) has 44 tens and 77 ones.
  2. Take away 11 ten:
    • 44 tens becomes 33 tens.
  3. Keep the 77 ones unchanged.

So,

47−10=3747-10=37

You can also think of it as moving back (10)(10) spaces on a number line: (47)(47) becomes (37)(37).

Learn by doing: Subtract 10 from a number

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    Subtraction - Whole Number - Subtract 10 from a Number

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