Subtract multiples of 10 mentally

This understanding involves subtracting a multiple of 10 from a whole number, typically within 1,000, by interpreting the operation as removing a specified number of tens while preserving the ones value. Place-value reasoning supports mentally adjusting the tens and, when necessary, regrouping across a hundred (for example, 462 − 70 = 392), rather than treating the digits as isolated symbols; work with larger numbers or more general subtraction algorithms is outside this scope.

Detailed Explanation: Subtract multiples of 10 mentally

To subtract a multiple of $10$ , think about removing tens. The ones digit usually stays the same.

Example:

462-70

$70$ is $7$ tens, so subtract $7$ from the tens in $462$ .
The number $462$ $462$ has $6$ $6$ tens. Since $6$ $6$ tens is not enough to remove $7$ $7$ tens, regroup $1$ $1$ hundred as $10$ $10$ tens:
- $462$ becomes $3$ hundreds, $16$ tens, and $2$ ones.
Subtract $7$ tens from $16$ tens:

16\text{ tens}-7\text{ tens}=9\text{ tens}

Keep the $2$ ones. Now there are $3$ hundreds, $9$ tens, and $2$ ones:

462-70=392

So, $\boxed{462-70=392}$ .

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Subtraction - Whole Number - Subtract Multiple of 10 from a Number

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Subtract multiples of 10 mentally

Detailed Explanation: Subtract multiples of 10 mentally

Learn by doing: Subtract multiples of 10 mentally

Practice with unlimited practice problems

Practice:

Subtraction - Whole Number - Subtract Multiple of 10 from a Number