Use mental math strategies to increase and decrease a whole number by 1%, 5%, 10%, 25%, 50%, and 100%
30 tutor-authored questions for this Ontario curriculum expectation, ordered easiest to hardest, every one with a full worked solution. Work through all 30 with your weekly-lesson access code.
Sample: the first question, solved
Increase 80 by 10%.
📘 Worked solution
✓80+8 = 88.
And one from the hard end
A store's price of $90 is first increased by 15%, then decreased by 15%. Is the final price the same as the original $90?
Solution shown after you try it in practice mode.
Work through all 30, easiest to hardest
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