Basic Mathematics

Basic Mathematics Warmups

Mental Shortcuts - Basic Warmup

         

Which of the following is equivalent to calculating 20% of 36?

Instead of multiplying by 5, it might be easier to multiply by 10.

Which of these is an easier version of 72×5 72 \times 5 ?

Which of these gives a nice shortcut to compute 34×11 34 \times 11 in your head?

Which of these is equivalent to 8888×5? 8888 \times 5 ?

When calculating 10036 100-36 by hand, we have to do a lot of "borrowing". It would be much easier to subtract from 99 instead. Which of the following is equivalent to 10036 100-36 ?

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