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BEGINNERMental Math
Subtract by Adding Up
Find the difference by counting up from the smaller number
SSCIBPS
Instead of subtracting, think: "How much do I need to add?"
How It Works
0
Start from the smaller number
1
Count up to nearest ten
2
Jump by tens/hundreds to the target
3
Add the final units
Examples
📝 213 - 67: 67→70(+3) →100(+30) →200(+100) →213(+13) = 3+30+100+13=146
📝 1000 - 648: 648→650(+2) →700(+50) →1000(+300) = 2+50+300=352
Pro Tips
💡 Great for calculating change or time differences!
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