There are several methods described for multiplying multi-digit numbers in 3 sentences or less: The rainbow method breaks down multiplication into single digit multiplications in a rainbow-like formation. Another method involves subtracting the highest place value if it is greater than the number being multiplied and adding it to the result. A third fast method directly writes the first digit and then adds and multiples subsequent digits to find the product.

1. EASY WAYS OF
MULTIPLICATION

2. METHOD 1
• RAINBOW METHOD
• In this method, we
perform multiplication
in the form of a
rainbow

3. eg: To multiply
23 x 21
2x2 = 4 1x3 =3
Then 23x21 = 4__3 23 x 21
(2x1=2 + 3x2=6) = 8
4__3 =483

4. • 41x31=12 __ 1
• 4x3 = 12 1x1 =1
• (4x1=4) +(1x3=3)=7
• 41x31 =1271
???

5. = = 30__3 ,
(5x3 =15) +(1x6=6) =21
+2
3013
=3213

6. 82x51
8x5 =40, 2x1=2
(8x1=8)+(2x5=10) =18
+1
82x51 = 40 8 2
= 4182

8. • 58x72
50 8
70 3500 560 4060
2 100 16 116
4176

9. 112x102
100 10 2
100 10000 1000 200 11200
0 0 0 0 0
2 200 20 4 224
=11424

11. 98=100—2 and 94 = 100—6
• So 98 94
2 6
• 98—6 or 94—2 =92 and 6x2 =12
98x94= 9212

12. 88x92
12 8
88—8=80 or 92—12= 80 and 12x8 =96
88x92 = 8096

13. • 21432 x11=2----2
• Write first digit as it is
• Then add 2and 1, then 1 and 4, then 4 and
3, then 3 and 2, then multiply 2 with 1
• 21432x11=235752

14. • 3563 x11
+1
• 3563x11= 38193
=39193