270, 250+121=?, 700-400=?, 613-300=?, 260+210=?, 61, 540-323=?, 30+31=?, 613-300=?, 400+102=?, 502, 400+102=?, 100-30=?, 30+31=?, 13+5=?, 33+30=?, 63, 24, 76, 55, 700-400=?, 100, 400, 300, 700, 70, 100-30=?, 700-400=?, 30+31=?, 250+121=?, 217, 250+121=?, 540-323=?, 30+31=?, 260+210=?, 54-21=?, 33, 23, 50, 43, 601-501=?, 200, 83, 100, 29, 42+58=?, 28, 100, 33, 90, 200-200=?, 1, 3, 0, 400.
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Mental Math Activity
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