There are a few approaches you can take.
1. Use a calculator.
2. Use the principles of long multiplication.
3. Use a trick such as 27 times 10 is 270. 15 is half as big again as 10 so the answer must be half as big again as 270 = 270 + 135 = 405.
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To square a number you multiply it by itself, to cube a number you then multiply itself twice! i.e. 3 times 3 is 9 and 9 times 3 is then 27 so 27 is 3 cubed
1 times 225 3 times 75 5 times 45 9 times 25 15 times 15
9 times
3(5-x) = 27 15 - 3x = 27 15 - 3x + 3x = 27 + 3x 15 = 27 + 3x 15 - 27 = 27 - 27 + 3x -12 = 3x -4 = x To check 3(5- -4) ? 27 15 - -12 ? 27 15 + 12 = 27
Nine times three equals twenty-seven.