Please refer to the trick enclosed in the word document. It works well for both multiplication of large numbers and multiplication for decimals

1. How to checkif your multiplicationiscorrect
Considertwobignumbers798324 X 9832 = 7849121568
Nowhowdo we check if thisiscorrect
Step1 Draw a bigX mark in the righthand side of the page
Nowadd up all the digitsinthe number798324  7+9+8+3+2+4 = 33 Addthese twonumberstogether
3 + 3 = 6 Nowtake digitandwrite itin positionA
Nowtake 9+8+3+2 = 22 = 2+2 = 4 write thisinpositionB
Now multiplyA andB = 6 * 4 = 24 addthese twodigits4 + 2 = 6 write itin positionC
Nowadd these digitsinthe answer7+8+4+9+1+2+1+5+6+8= 51
Addthe digits5 + 1 = 6. Write thisin positionD
Draw a straightline andsee if the twonumbersare equal if theyare equal yourmultiplicationiscorrect
6
4
6 6
A
B
C D
Note that C and D shouldbe equal thisconfirmsthatyouransweriscorrect
Example 2
100 * 3 = 300
1+ 0 + 0 = 1  Write it inpositionA
Secondnumberis3 so write itin positionB
The Multiple 3 * 1 answeris3 write itin positionC
The answeryou gotby multiplicationis300 = 3+ 0 + 0 = 3 so write itinpositionDif positionCandD are
equal youranswerisright

2. 1
3
3 3
A
B
C D
Example 3
4070 X 1876 4+0+7+0 = 11 1+1 = 2
---------------- 1+8+7+6 = 22 2+2 = 4
24420 4 * 2 = 8
28490X 7+6+3+5+3+2+0 = 26 2 + 6 = 8
32560XX
4070XXX
-----------------------------
7635320
2
4
8 8
A
B
C D
Example 4
4070 X 0.5 = 2035
4 + 0 + 7 + 0 = 11  1+ 1 = 2
5 + 0 = 5
5 * 2 = 10  1+ 0 = 1
2+0+3+5 = 10  1+ 0 = 1

3. 2
5
1 1
A
B
C D
Example 5
10459.2 X 1.3245 = 13853.2104
10459.2 = 1 + 0 + 4 + 5 + 9 + 2 = 21  2 + 1 = 3
1.3245 = 1+ 3+ 2+ 4+ 5 = 1+ 3+ 2+ 4+ 5 = 15  1+5 = 6
6 X 3 = 18  1+ 8 = 9
13853.2104 = 1+3+8+5+3+2+1+0+4 = 27  2+ 7 = 9
6
3
9 9
A
B
C D
Once you have checkedthe multiplicationjustplace the decimalpointatthe rightplace