Mental strategies to multiply whole numbers by 10, 100, and 1000, divide by 10, and add/subtract decimal tenths
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
What is 5×10?
📘 Worked solution
✓50.
And one from the hard end
A factory produces 45 items per hour. Using mental math, how many in 1000 hours?
Solution shown after you try it in practice mode.
Work through all 30, easiest to hardest
Your Winny Score tracks you as the questions ramp up. Stuck on one? A real Winny Math tutor will walk you through it. First lesson free.
Start practicing