Squaring the numbers:
1. Squaring the numbers ending with 5.
Ø Separate the 5 from the digits in front. in this case there is only a 3 in front of the 5. Add 1 to 3 get 4 (3+1= 4)
Ø Multiply these numbers together: 3 x 4 = 12
Ø Write the square of 5 (25) after 12. We will get 1225.
135 2 = ??Ø Take 13, add 1 to it we will get 14.
Ø Then 13 x 14 = 182
Ø Add the square of 5 next to it. We will get 18225.
Ø To get the rest of the answer, we square the number in the minus. ( 4 2= 16)
Ø Add 2100 and 16 we will get 2116 is the answer.
Ø Fifty six squared means 56 x 56. Rounding upwards, 50 x 50 = 2500.
Ø Take 50 and 2500 as our reference points.
56 = 50+6, so 6 is a positive number.
Ø So we add 6 to 25 hundreds.
Ø (25+6) x 100= 3100
Ø To get the rest of the answer, we square the number in the minus. ( 62= 36)
Ø Add 3100 and 36 we will get 3136 is the answer.
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