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QuestionHow would I multiply 0.2279 x 0.029 using method 2?DonaganTop AnswererFirst, temporarily remove the decimal points and multiply 2279 by 29. Then, note that there are a total of seven decimal places to the right of the decimal points in the two numbers. The decimal point in the final product is placed by counting seven spaces from the right, so that there are seven decimal places to the right of the final decimal point.
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QuestionHow do I multiply a whole number with a decimal?Community AnswerYou do the same thing as method 2 and ignore the decimal until the end and count the numbers that are behind the decimal. In your answer count from right to left and place the decimal, for example: 0.3x0.4=.12 -- in the beginning 2 numbers all together were behind the decimal and in the end 2 numbers were behind the decimal.
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QuestionHow do I multiply if one digit is zero?Community AnswerIf one number is 0 then the product is 0. For example: 2 x 0 = 0 because two groups of zero means that 0+0=0.
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QuestionHow do I multiply 814 with 8 as the top number?DonaganTop AnswererLet 814 be the top number if possible - it's easier that way. If 8 has to be the top number, you'll just have to multiply the 8 three times (by 4, 1, and 8), making sure each partial product is placed in the correct columns. Essentially you're just doing the same process backwards.
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QuestionWhat if it is 32 x 23 - how do you times that with Method 1?Community AnswerMethod 1 is meant for simpler problems. If you wanted to use it, it would work the same way as the example - you'd have to make 23 groups of 32 and add them all up (32 + 32 + 32 + .... + 32). You should use Method 2 for this one.
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QuestionHow do I multiply something like 7 x 3/5?DonaganTop AnswererMultiply the whole number by the numerator of the fraction, and leave the denominator unchanged. Then convert the answer to a mixed number, if needed. For multiplying two fractions together, see How to Multiply Fractions .
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QuestionHow do I multiply a number by a fraction?DonaganTop AnswererMultiply the numerator by the whole number. Leave the denominator unchanged. Reduce the final fraction if possible. The final answer will be a mixed number if the final numerator is larger than the denominator. For example, to multiply 5 by 8/10, you would multiple 5 by 8 to get 40, which would then become 40/10, which is reduced to 4.
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QuestionHow do I multiply 8.2 times 365 with 8.2 on top?Community AnswerIt doesn't matter which number is on top: you do it the same either way. Ignore the decimal point until the very end. Multiply 365 by 82. Then you position the decimal point one place to the left of the right end of the product (because there is a total of one decimal place in the original numbers being multiplied).
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QuestionHow do I multiply 4 digits by 3?DonaganTop AnswererUse the technique shown in Method 2 above with one extra (but identical) step.
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QuestionDon't we have calculators for this?DonaganTop AnswererOf course, but the whole point of studying a subject is to understand the principles and operations involved (and to avoid being helpless should a calculator be unavailable).
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QuestionIs the box method for multiplication really accurate?DonaganTop AnswererIf you're careful, any method will be accurate. The box method is just a way to show more clearly what is happening when we multiply. It, too, could be subject to mistakes if we're not careful.
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QuestionWhich method can I use for 24x49?Tina XCommunity AnswerYou can use any method for 24 x 49. Long multiplication might be the best option.
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QuestionHow do I multiply 3.14 x 100?I_l1ke_gam3sCommunity AnswerMove the decimal point in the first number two places to the right. (100 has two zeros in it, so you move the decimal point two places.) The answer is 314.
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QuestionHow do you multiply 3 digit by 3 digit?Community AnswerFirst multiply the multiplicand by the ones digit of the multiplier. Write the partial product directly below the multiplier. Next multiply the multiplicand by the tens digit of the multiplier, and write that partial product below the first partial product offset to the left one column. Finally multiply the multiplicand by the hundreds digit of the multiplier, and write that partial product below the second partial product offset to the left one column. Then add up each column (carrying when necessary) to find the final product.
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Question4 times 8 4 times (5+3)=I_l1ke_gam3sCommunity Answer(4)(8) = (4)(5 + 3) = (20) + (12) = 32.
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QuestionHow do you multiply four digits by four digits?I_l1ke_gam3sCommunity AnswerThe same process with any digit, but it's recommended to use a calculator to solve something like (1234)(5678), as it is easier to make a mistake doing long multiplication when the number of digits is bigger.
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QuestionCan you multiply by a negative number?Community AnswerYes. Numerically it's the same as multiplying by a positive number. Only the sign of the answer will be different. If you multiply a positive number by a negative number, the product will be negative. If you multiply a negative number by a negative number, the product will be positive. When you multiply more than two numbers together, if you are multiplying an odd number of negatives, the product will be negative. If you are multiplying an even number of negatives, the answer will be positive. (The positive numbers don't affect the sign of the product.)
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QuestionHow do you break apart a problem like 6 times 8?I_l1ke_gam3sCommunity Answer(6)(8) is the same thing as adding eight 6's together. (6)(8) = 6 + 6 + 6 + 6 + 6 + 6 + 6 + 6 = 48.
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