$math games with multiplication tables$

The first is a pain in the ass to compute but the second you just move the decimal point. Percentages are reversible so 5% of 10 is the same as 10% of 5. Up to 11*9 it's just two repeat numbers like 11, 22, 33, etc.

I like to memorize 9*5=45 as a good midline so I can go up or down from there. With 18, 27, 36, etc, you just see this pattern. You can either do ×10 and subtract 1×however times you multiplied by 9 or you can see that after 18 the second number just goes down by one as the first number goes up by one. For instance, 27 is 2+7 which adds to 9 which is a multiple of 3.ĭivide by 2 twice, or do it once and see if it still follows the rules for 2.įollow rules for 2 and 3, if it follows both it's divisible by 6. If the numbers add up to a multiple of 3 then it's divisible by 3. If it's an even number ( 0,2,4,6, or 8) it's a multiple of 2. If you play Minecraft, you'll learn multiples of 64 really well (2, 4, 8, 16, 32).Īs a non gaming approach, there's a lot of arithmetic tricks that come in handy for seeing if something is a multiple of something else.

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Math games with multiplication tables