Fast review mode: answers are shown by default so you can skim quickly. Hide them if you want to self-test.
Tip: With numbers less than 1,000, add the hundreds first, then the tens and then the units.
For example: 120 + 360 + 22 + 8 = (100 + 300) + (20 + 60 + 20) + (2 + 8) = 400 + 100 + 10 = 510
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