Algorithms for adding and subtracting whole numbers
10 tutor-authored questions for this Ontario curriculum expectation, ordered easiest to hardest — every one with a full worked solution. Work through them free, no account needed.
Sample: the first question, solved
Use the standard algorithm to add 123+245.
📘 Worked solution
✓123+245=368.
And one from the hard end
Add 678+289 using the column algorithm, showing carrying.
Solution shown after you try it in practice mode.
Work through all 10, easiest to hardest
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