I need multiplication shortcuts on two-digit numbers. Examples are multiplying two digit multipliers to three digit multiplicand. Please help me with this!
2007-09-12 23:49:20 · 7 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
to multiply to numbers between 10-20
for example
13
12
3*x2=6
3+2=5
1*1=1
13*12=156
14
12
4*2=8
4+2=6
1*1=1
14*12=168
19
12
9*2=18 ,there is an overflow of 1
9+2+1=12, an overflow of 1 again
1*1 +1 =2
19*12=228
There are still plenty shortcuts i have known, you may want to play with numbers and discover it by yourself.
2007-09-13 00:25:52 · answer #1 · answered by ptolemy862000 4 · 0⤊ 0⤋
Why not use a calculator? If that is not allowed, read below.
If you need to multiply a number say 234 with 99, you could write that as 234 (100 -1) = 23400 - 234 = 23166
Addition and subtraction are easy compared to multiplication and division.
Multiplication by 11, 22, 33 etc. can be simplified this way:
345 x 11 = 345 (10 + 1) = 3450 + 345 = 3795
345 x 22 = 2 x 345 x 11
I hope you got the idea.
2007-09-13 00:03:00 · answer #2 · answered by Swamy 7 · 0⤊ 0⤋
Multiplication Shortcuts
2016-11-13 04:30:04 · answer #3 · answered by ? 4 · 0⤊ 0⤋
there are only 22 last 2 digits of any number squared
ok so how does that help
well (a+b)*(a-b)=a^2-b^2
so
well 29*41
=35^2-6^2
ok but 35^2
well
is the reverse u should know 4*3=12
so 3.5^2=12.25
35^2=1225
therefore 29*41=1225-36=1189
what are the 22
01
04
09
16
25
36
49
64
81
00
21
44
69
96
56
89
24
61
41
84
29
76
try some things out
2007-09-13 00:27:33 · answer #4 · answered by GOLD-FLAW 2 · 0⤊ 0⤋
in case you are able to bear in ideas numbers obtained from "communities," then sure, that's extremely conceivable. Say you like to locate the made of 18 and 12. you need to destroy that up into: 18*10=a hundred and eighty AND 18*2=36 then you certainly ought to easily upload those jointly to get 216, or a minimum of that's how I do it.
2016-11-15 02:52:19 · answer #5 · answered by Anonymous · 0⤊ 0⤋
there are no shortcuts you have to learn and memorize the process.
If you aren't going to set your mind to mastering multiplication - understanding multiplication, division, percents, decimals, fractions, exponents, and negative numbers - then you might as well forget about math and plan on becoming an English or Philosophy major.
2007-09-13 00:04:09 · answer #6 · answered by trogwolf 3 · 0⤊ 0⤋
search mo sa youtube math calculator meron dun kung pano mapa dali ung multiplication pra sa two digit numbers
2007-09-12 23:59:25 · answer #7 · answered by Anonymous · 0⤊ 0⤋