Use knowledge of facts and unitising to add and subtract multiples of ten
Lesson 3 / 10
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I can use knowledge of known facts and unitising to add and subtract multiples of ten.
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Tens numbers can be added to or subtracted from a multiple of ten.
When you add a tens number to a multiple of ten the tens number increases.
When you subtract a tens number from a multiple of ten the tens number decreases.
If 3 + 1 is equal to 4 then 3 tens + 1 ten is equal to 4 tens which is equal to 40
If 4 - 1 is equal to 3 then 4 tens subtract 1 ten is equal to 3 tens which is equal to 30
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