Ten more and ten less

Find ten more or less without recounting

Problem types

Reading and writing tens and ones
Teen numbers as a ten and ones · Earlier idea
A teen is ten plus ones, so ten more than 14 changes the tens and leaves the ones, which is the same idea as for larger numbers.

Adding or subtracting 10 or 100 mentally · Extend the idea
Changing the tens digit by one extends to changing the hundreds digit by one.
Adding within 100 · See it applied
Adding a number of tens to a two-digit number changes only the tens digit, which gives a quick way to add within 100.
Place value of large whole numbers · Extend the idea
Each place is ten times the place to its right, which is the idea behind ten more or ten less, applied to larger numbers.
Decimal place value through thousandths · Extend the idea
Each place is one tenth of the place to its left, so ten less at one place and one tenth of the next place use the same pattern.
Working in scientific notation · Extend the idea
Ten times more moves every digit one place left, and repeating that many times is what the power of ten in scientific notation records.

Skip-counting · Related idea
Counting by tens is repeating ten more: 10, 20, 30, 40.
Add two-digit numbers · Shared foundations
Compare two-digit numbers · Shared foundations
Hundreds, tens, and ones · Shared foundations
Multiplying by a multiple of 10 · Shared foundations

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