@ChiefSinner@lemm.ee to Memes@lemmy.ml • 1 year agomath is hardlemm.eeimagemessage-square24arrow-up1199
arrow-up1199imagemath is hardlemm.ee@ChiefSinner@lemm.ee to Memes@lemmy.ml • 1 year agomessage-square24
minus-square@bstix@feddit.dklinkfedilink3•1 year agoMultiplication of x times 6: x * 6 = 1/2 x * 10 + x This can sometimes be a shortcut for numbers that are easier to divide by 2 than to multiply by 6. Take half as tens and add the number. 6 * 6 = 30 + 6 = 36 8 * 6 = 40 + 8 = 48 150 * 6 = 750 + 150 = 900 320 = 1600 + 320 = 1920 Etc. Sleep well.
minus-square@lunarul@lemmy.worldlinkfedilink2•edit-21 year agoSonan extension of the x * 5 = x/2 * 10 shortcut
Multiplication of x times 6:
x * 6 = 1/2 x * 10 + x
This can sometimes be a shortcut for numbers that are easier to divide by 2 than to multiply by 6.
Take half as tens and add the number.
6 * 6 = 30 + 6 = 36
8 * 6 = 40 + 8 = 48
150 * 6 = 750 + 150 = 900
320 = 1600 + 320 = 1920
Etc.
Sleep well.
Sonan extension of the x * 5 = x/2 * 10 shortcut