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21 Cards in this Set

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  • Back
45 squared
2025
4*5=20
two digit number ends in 5 second half 25
75 squared
7*8 = 56
two digit number ends in 5 second half 25
5625
95 squared
9*10=90
two digit number ends in 5 second half 25
9025
two digit numbers ending in 5
25 is the end and then multiply the tens digit by one greater
25 squared
3*2 = 6
two digit number ends in 5 second half 25
625
85 squared
8*9=72
two digit number ends in 5 second half 25
7225
65 squared
7*6 = 42
two digit number ends in 5 second half 25
4225
Squaring two digit numbers in 50's
start with 25 and add the ones digit to it.
Square the ones digit and tack on to the end of the first part.
If you end up with a one digit answer put a 0 in front.
Example 51 squared
25+1 = 26
1 squared = 1 so add a 0 in front and
2601 = 51 squared
55 squared
25 add ones digit = 25+5 = 30
square ones digit = 5 squared = 25
3025 = 55 squared
58 squared
25 + 8 = 33
8 squared is 64
3364
52 squared
start with 25 add ones digit
25+2 = 27
square ones digit and tack on the end
2 squared = 4 add a 0 in front because it is only one digit
2704 = 52 squared
57 squared
25+7=32
7 squared = 49
3249
56 squared
25+6=31
6 square =36
3136
59 squared
25+9= 34
9 square = 81
3481
53 squared
25 + 3 = 28
3 squared = 9
add 0 in front because it is a one digit number
2809
57 squared
25+7= 32
7 squared = 49
3249
squaring two digit numbers in the 40's
begin with 15 add ones digit
how much less than 50 is the number you are squaring
50 minus whatever number you are squaring
square that number
tack this number onto the first
example
46 squared = 15+6 = 21
50-46 = 4
4 squared is 16
2116 = 46 squared
41 square
15+1 = 16
50-41 =9
9 squared =81
1681 = 41 squared
47 square
15 + 7 = 22
50 - 47 = 3
3 squared = 9
nine is a one digit so a 0 goes in front
47 squared = 2209
45 squared
15 + 5 = 20
50 - 45 = 5
5 squared = 25
45 squared 2025
49 squared
15 + 9 = 24
50 - 49 = 1
1 squared = 1 since it is one digit add 0 in front
49 squared is 2401