Multiplying
2 digit numbers where the tens’ digit is the same and the units’ digit add up
to 10
E.g.:
42 x 48
1. First multiply the units digit of the two
numbers: 2 x 8 = 16
2. Then multiply the tens digit by its
succeeding number, 4x(4+1) = 4x5 = 20.
Multiplying
2 digit numbers where the tens’ digit numbers add up to 10 and the units’ digit
is the same
E.g.:
44 x 64
1. First find the multiplication of the last
2 digits of both the numbers i.e. 4x4 = 16
2. Multiply the tens’ digits and add the
common digit to the multiplication i.e. (4x6)+4 = 28
3.
The final answer is 2816
Now try to solve these 10 questions as
fast as possible (3-5min)
1.
74
x 76=?
(a)
4924 (b)
5624 (c) 5424 (d) 5024
2.
41
x 49=?
(a)
1909 (b) 2081 (c)
2009 (d) 2109
3.
81
x 89=?
(a)
8109 (b)
8181 (c) 7281 (d)
7209
4.
65
x 65 =?
(a)
4225 (b)
4275 (c) 3625 (d) 3675
5.
29
x 21=?
(a)
409 (b)
609 (c) 481 (d)
681
6.
45
x 65=?
(a)
2975 (b)
2925 (c) 2425 (d) 3025
7.
28
x 88 =?
(a)
2664 (b)
2648 (c) 2464 (d) 2848
8.
33
x 73=?
(a)
2109 (b) 2437 (c) 2327 (d) 2409
9.
81
x 21 =?
(a)
1701 (b)
1601 (c) 1621 (d) 1721
10.
67
x 47=?
(a)
3049 (b) 3149 (c) 2407 (d)
2449
SOLUTIONS
1 b 2 c 3 d 4 a 5 b
6 b 7 c 8 d 9 a 10
b
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