Give the kid the "trick" and give yourself a calculator. Race to see who gets the answer first. (Let them win!)
Most kids struggle with numbers that require "carrying" or "borrowing." Friendly numbers make those problems disappear. Mental Math Kids Can't Resist!: Tips, Short-cut...
This is how our brains naturally read, so it feels more intuitive than the "stacking" method. 5. Squaring Numbers Ending in 5 This one makes kids look like absolute geniuses. The Trick: To square a number like 25, 35, or 75: The answer always ends in 25. Give the kid the "trick" and give yourself a calculator
It’s great for any problem involving a 5 or an even number. 4. "Front-End" Addition This is how our brains naturally read, so
If the middle sum is 10 or more (like 87 x 11), just carry the "1" to the first digit! 3. The "Doubling and Halving" Method
At a restaurant, ask them to mentally calculate the 10% or 20% tip before you look at the receipt.
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