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Title: maths shortcut trick
Description: The Best Trick Every multiplication has a twin, which may be easier to remember. For example if you forget 8×5, you might remember 5×8. This way, you only have to remember half the table. Tricks by Number to multiply by Trick 2 add the number to itself (example 2×9 = 9+9) 5 the last digit goes 5, 0, 5, 0, ... is always half of 10× (Example: 5x6 = half of 10x6 = half of 60 = 30) is half the number times 10 (Example: 5x6 = 10x3 = 30) 6 when you multiply 6 by an even number, they both end in the same digit. Example: 6× 2=12, 6×4=24, 6×6=36, etc 9 the last digit goes 9, 8, 7, 6, ... your hands can help! Example: to multiply 9 by 8, hold your 8th finger down, and count "7" and "2", the answer is 72 is 10× the number minus the number. Example: 9×6 = 10× 6−6 = 60−6 = 54 when you add the answer's digits together, you get 9. Example: 9×5=45 and 4+5=9. (But not with 9×11=99) 10 put a zero after it 11 up to 9x11: just repeat the digit (Example: 4x11 = 44) for 10x11 to 18x11: write the sum of the digits between the digits Example: 15x11 = 1 (1+5)5 = 165 Note: this works for any two-digit number, but when the sum of the digits is more than 9, we need to" carry the one". Example: 75x11 = 7(7+5)5 = 7(12)5 = 825. 12 is 10× plus 2× Remembering Squares Can Help This may not work for you, but it worked for me. I like remembering the squares (where you multiply a number by itself): 1×1=1 2×2=4 3×3=9 4×4=16 5×5=25 6×6=36 7×7=49 8×8=64 9×9=81 10×10=100 11×11=121 12×12=144 And this gives us one more trick. When the numbers we are multiplying are separated by 2 (example 7 and 5), then multiply the number in the middle by itself and subtract one. See this: 5×5 = 25 is just one bigger than 6×4 = 24 6×6 = 36 is just one bigger than 7×5 = 35 7×7 = 49 is just one bigger than 8×6 = 48 8×8 = 64 is just one bigger than 9×7 = 63
Description: The Best Trick Every multiplication has a twin, which may be easier to remember. For example if you forget 8×5, you might remember 5×8. This way, you only have to remember half the table. Tricks by Number to multiply by Trick 2 add the number to itself (example 2×9 = 9+9) 5 the last digit goes 5, 0, 5, 0, ... is always half of 10× (Example: 5x6 = half of 10x6 = half of 60 = 30) is half the number times 10 (Example: 5x6 = 10x3 = 30) 6 when you multiply 6 by an even number, they both end in the same digit. Example: 6× 2=12, 6×4=24, 6×6=36, etc 9 the last digit goes 9, 8, 7, 6, ... your hands can help! Example: to multiply 9 by 8, hold your 8th finger down, and count "7" and "2", the answer is 72 is 10× the number minus the number. Example: 9×6 = 10× 6−6 = 60−6 = 54 when you add the answer's digits together, you get 9. Example: 9×5=45 and 4+5=9. (But not with 9×11=99) 10 put a zero after it 11 up to 9x11: just repeat the digit (Example: 4x11 = 44) for 10x11 to 18x11: write the sum of the digits between the digits Example: 15x11 = 1 (1+5)5 = 165 Note: this works for any two-digit number, but when the sum of the digits is more than 9, we need to" carry the one". Example: 75x11 = 7(7+5)5 = 7(12)5 = 825. 12 is 10× plus 2× Remembering Squares Can Help This may not work for you, but it worked for me. I like remembering the squares (where you multiply a number by itself): 1×1=1 2×2=4 3×3=9 4×4=16 5×5=25 6×6=36 7×7=49 8×8=64 9×9=81 10×10=100 11×11=121 12×12=144 And this gives us one more trick. When the numbers we are multiplying are separated by 2 (example 7 and 5), then multiply the number in the middle by itself and subtract one. See this: 5×5 = 25 is just one bigger than 6×4 = 24 6×6 = 36 is just one bigger than 7×5 = 35 7×7 = 49 is just one bigger than 8×6 = 48 8×8 = 64 is just one bigger than 9×7 = 63
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axmag
Title: maths shortcut trick
Description: The Best Trick Every multiplication has a twin, which may be easier to remember. For example if you forget 8×5, you might remember 5×8. This way, you only have to remember half the table. Tricks by Number to multiply by Trick 2 add the number to itself (example 2×9 = 9+9) 5 the last digit goes 5, 0, 5, 0, ... is always half of 10× (Example: 5x6 = half of 10x6 = half of 60 = 30) is half the number times 10 (Example: 5x6 = 10x3 = 30) 6 when you multiply 6 by an even number, they both end in the same digit. Example: 6× 2=12, 6×4=24, 6×6=36, etc 9 the last digit goes 9, 8, 7, 6, ... your hands can help! Example: to multiply 9 by 8, hold your 8th finger down, and count "7" and "2", the answer is 72 is 10× the number minus the number. Example: 9×6 = 10× 6−6 = 60−6 = 54 when you add the answer's digits together, you get 9. Example: 9×5=45 and 4+5=9. (But not with 9×11=99) 10 put a zero after it 11 up to 9x11: just repeat the digit (Example: 4x11 = 44) for 10x11 to 18x11: write the sum of the digits between the digits Example: 15x11 = 1 (1+5)5 = 165 Note: this works for any two-digit number, but when the sum of the digits is more than 9, we need to" carry the one". Example: 75x11 = 7(7+5)5 = 7(12)5 = 825. 12 is 10× plus 2× Remembering Squares Can Help This may not work for you, but it worked for me. I like remembering the squares (where you multiply a number by itself): 1×1=1 2×2=4 3×3=9 4×4=16 5×5=25 6×6=36 7×7=49 8×8=64 9×9=81 10×10=100 11×11=121 12×12=144 And this gives us one more trick. When the numbers we are multiplying are separated by 2 (example 7 and 5), then multiply the number in the middle by itself and subtract one. See this: 5×5 = 25 is just one bigger than 6×4 = 24 6×6 = 36 is just one bigger than 7×5 = 35 7×7 = 49 is just one bigger than 8×6 = 48 8×8 = 64 is just one bigger than 9×7 = 63
Description: The Best Trick Every multiplication has a twin, which may be easier to remember. For example if you forget 8×5, you might remember 5×8. This way, you only have to remember half the table. Tricks by Number to multiply by Trick 2 add the number to itself (example 2×9 = 9+9) 5 the last digit goes 5, 0, 5, 0, ... is always half of 10× (Example: 5x6 = half of 10x6 = half of 60 = 30) is half the number times 10 (Example: 5x6 = 10x3 = 30) 6 when you multiply 6 by an even number, they both end in the same digit. Example: 6× 2=12, 6×4=24, 6×6=36, etc 9 the last digit goes 9, 8, 7, 6, ... your hands can help! Example: to multiply 9 by 8, hold your 8th finger down, and count "7" and "2", the answer is 72 is 10× the number minus the number. Example: 9×6 = 10× 6−6 = 60−6 = 54 when you add the answer's digits together, you get 9. Example: 9×5=45 and 4+5=9. (But not with 9×11=99) 10 put a zero after it 11 up to 9x11: just repeat the digit (Example: 4x11 = 44) for 10x11 to 18x11: write the sum of the digits between the digits Example: 15x11 = 1 (1+5)5 = 165 Note: this works for any two-digit number, but when the sum of the digits is more than 9, we need to" carry the one". Example: 75x11 = 7(7+5)5 = 7(12)5 = 825. 12 is 10× plus 2× Remembering Squares Can Help This may not work for you, but it worked for me. I like remembering the squares (where you multiply a number by itself): 1×1=1 2×2=4 3×3=9 4×4=16 5×5=25 6×6=36 7×7=49 8×8=64 9×9=81 10×10=100 11×11=121 12×12=144 And this gives us one more trick. When the numbers we are multiplying are separated by 2 (example 7 and 5), then multiply the number in the middle by itself and subtract one. See this: 5×5 = 25 is just one bigger than 6×4 = 24 6×6 = 36 is just one bigger than 7×5 = 35 7×7 = 49 is just one bigger than 8×6 = 48 8×8 = 64 is just one bigger than 9×7 = 63