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Adding and Subtracting 10

  • When we add or subtract 10 from a number, only the digit in the tens place changes.

Solved Examples

Example 1: Here is a pile of 10 books.
How many books would there be if we added 10 more books?

Sol:
10 more and 10 less | Year 3 MathematicsThere would be 20 books.
10 + 10 = 20
10 more and 10 less | Year 3 Mathematics

Example 2: There are 70 pencils in the classroom.
How many pencils are left if 10 pencils are being used?
Sol:

10 more and 10 less | Year 3 Mathematics

If there are 70 pencils in a classroom and 10 pencils are being used, then there are 60 pencils left.
Therefore, 70 - 10 = 60.

Example 3: On Monday 4 children came to school on scooters. On Tuesday 10 more children came to school on scooters.
How many children rode a scooter to school on Tuesday?

10 more and 10 less | Year 3 Mathematics

Thus, 4 + 10 = 14, indicating that 14 children rode scooters to school on Tuesday.

The document 10 more and 10 less | Year 3 Mathematics is a part of the Year 3 Course Year 3 Mathematics.
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