Use efficient methods to solve subtraction equations
Lesson 6 / 15
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I can use efficient methods to solve subtraction equations.
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Consecutive numbers always have a difference of 1
If the whole and the known part in a subtraction equation are consecutive numbers, the missing part will always be 1
If the known part in a subtraction equation is 1, the whole and the missing part will be consecutive numbers
When the ones digits in the whole and the known part are the same, the missing part will be a multiple of 10
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