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21 Cards in this Set
- Front
- Back
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45 squared
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2025
4*5=20 two digit number ends in 5 second half 25 |
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75 squared
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7*8 = 56
two digit number ends in 5 second half 25 5625 |
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95 squared
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9*10=90
two digit number ends in 5 second half 25 9025 |
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two digit numbers ending in 5
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25 is the end and then multiply the tens digit by one greater
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25 squared
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3*2 = 6
two digit number ends in 5 second half 25 625 |
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85 squared
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8*9=72
two digit number ends in 5 second half 25 7225 |
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65 squared
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7*6 = 42
two digit number ends in 5 second half 25 4225 |
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Squaring two digit numbers in 50's
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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 |
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55 squared
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25 add ones digit = 25+5 = 30
square ones digit = 5 squared = 25 3025 = 55 squared |
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58 squared
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25 + 8 = 33
8 squared is 64 3364 |
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52 squared
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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 |
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57 squared
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25+7=32
7 squared = 49 3249 |
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56 squared
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25+6=31
6 square =36 3136 |
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59 squared
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25+9= 34
9 square = 81 3481 |
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53 squared
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25 + 3 = 28
3 squared = 9 add 0 in front because it is a one digit number 2809 |
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57 squared
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25+7= 32
7 squared = 49 3249 |
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squaring two digit numbers in the 40's
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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 |
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41 square
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15+1 = 16
50-41 =9 9 squared =81 1681 = 41 squared |
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47 square
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15 + 7 = 22
50 - 47 = 3 3 squared = 9 nine is a one digit so a 0 goes in front 47 squared = 2209 |
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45 squared
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15 + 5 = 20
50 - 45 = 5 5 squared = 25 45 squared 2025 |
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49 squared
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15 + 9 = 24
50 - 49 = 1 1 squared = 1 since it is one digit add 0 in front 49 squared is 2401 |
