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21 Cards in this Set
 Front
 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 5046 = 4 4 squared is 16 2116 = 46 squared 
41 square

15+1 = 16
5041 =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 