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Multiplication Made Easy
What is multiplication? Rows and columns 4 x 3= 4 groups of 3
same as the number; imagine it as one group of the number
double the original
we double the number than double again!
4s If 4 x 6= 6x2x2=12+12=24 Then 234x4=234x234=(468)x2 =936 Try 22x4=______
we double the number and then add one more set
Square numbers-make a diagonal on the number chart
Also 11x11=121 12x12=144 Try 13x13=____
just add a zero
10s 10x5=50 (5 and add a zero at the end) 10x 234=2340 Try 10 x 3456=_______ Try 1000 x 239=_______
multiply by 10 and then divide by two; all numbers end with 0 or 5
5s Try 5 x4= (10 x 4)/2=40/2=20 Try 5 x32= Try 5 x 400=
multiply by 10 and remove a set; the digits always add to 9
9s If 9x4=36 (10x4-4) Then 9x43= ____ (10x43-43) Try 9x290=________ Try 9X365=________
x7; 6x8; 7x8= the ugly ones
The ugly ones 6x7=42(e.g. 6x7=(6x6)+(6x1)) 6x8=48 7x8=56
—double the digit
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