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25 x 12
=(20+5)(10+2)
20×10+20×2+5 x 10+5×2
200+40+50+10
=300
132×11
b) 55×13
101 202 =
Ac

By Claire

25 x 12
=(20+5)(10+2)
20×10+20×2+5 x 10+5×2
200+40+50+10
=300
132×11
b) 55×13
101 202 =
Activity 2
If we know the product of two numbers, how can we find that the product of two numbers
obtained by adding a fixed number to each.
We know
20×30
then 21×31
= 600
= (20+1)(30+1) = 20 x 30+(20+30)x1+1
= 651
= (20+2)(30+2) = 20×30+ (20+30)x2 +22
600+100+4 = 704
20×30+(20+30)3+32 =
22×32
23×33
24×34
In general
(x+a)(y+a)
= xy+​

About the author
Claire

formula of binomial
[tex](2x + 5) and (3 + x)[/tex]
​

A water tank holds 500 liters of water. The school uses 375 liters of water in a day. How much water is left for the next day? If

1 thought on “25 x 12<br />=(20+5)(10+2)<br />20×10+20×2+5 x 10+5×2<br />200+40+50+10<br />=300<br />132×11<br />b) 55×13<br />101 202 =<br />Ac”

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