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Q&A for How to Do Double Digit Multiplication
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QuestionShould I always add zero in the second column?DonaganTop AnswererYes, if it helps you keep your place. Lots of people don't bother with the zero.
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QuestionWhy does there have to be a 0 on the bottom?Community AnswerThe zero doesn't have to be there. It's just a good reminder that the second partial product has to be offset one column to the left compared to the first partial product. Otherwise, you'll get the wrong answer.
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QuestionWill this work for 3-digit numbers?DonaganTop AnswererYes, the process is the same. If the multiplier is a three-digit number, you wind up with three partial products instead of two before adding up the answer.
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QuestionCan someone walk me through the process of 95x48 please?DonaganTop AnswererFirst multiply 8 x 95 = 760 and 4 x 95 = 380. Write those two partial products on separate lines below the multiplication bar. First you write 760. Below that you write 380 by placing the zero immediately below the 6 in 760. Place the 8 below the 7. Place the 3 to the left of the 8 (below nothing). Then add the partial products together starting with the right-hand column, which consists of one zero. The next column consists of a 6 and a zero. The next column consists of a 7 and an 8. The left-hand column has only a 3. Add the partial products together that way to get 4560. That's your answer.
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QuestionDo I always have to add for two-digit multiplication?DonaganTop AnswererYes, if the multiplier has at least two digits, you will have at least two partial products which must be added together.
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QuestionWhat are the middle level products called?Community AnswerThey're called "partial products."
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QuestionHow do I do multiples of a 2 digit number?DonaganTop AnswererYou just multiply the two-digit number by various whole numbers such as 2, 3, 4, 5, etc. For example, multiples of 25 are 50, 75, 100, 125, etc.
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QuestionCan you take me through the process of 72 x 72?DonaganTop AnswererThe first partial product results from multiplying the first 72 by the digit 2 of the second 72. The first partial product is 144, written so that "44" is directly below the second 72. The second partial product is 504, written so that "04" is directly below the "14" of the first partial product. There are now four columns among the two partial products. Add the columns beginning with the right-hand column, 4+0=4. In the next column to the left, 4+4=8. In the next column, 1+0=1. In the left-hand column, 0+5=5. The final product is 5,184.
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QuestionCan you please explain step 4 more clearly?Community AnswerDo the same thing you did in step 2, just multiply the digit in the tens place (instead of the ones place) of the bottom number by the top number. And write the result in front of the 0 you placed in step 3. For example, if you're multiplying 15 x 23, in step 4 you would multiply 5 x 2 and 1 x 2.
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QuestionWhen doing decimal multiplication with double digits, where does the decimal go?DonaganTop AnswererCount the number of places there are to the right of the decimal point in the multiplicand and/or the multiplier. That number is the number of places to the right of the decimal point in the product. For example, if the multiplicand has one place to the right of the decimal, and the multiplier has two places to the right of the decimal point, the product will have three places to the right of the decimal point.
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QuestionWhat do I do when there is a remainder?DonaganTop AnswererIn multiplication there is never a remainder. Remainders occur only in division, because in many cases one number will not divide evenly into another number.
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QuestionDoes this work four 4-digit numbers?DonaganTop AnswererYes, it works for numbers of any size.
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QuestionIf I multiply 0 times a number, do I have one zero or multiple 0s?Community AnswerJust one zero. Any number multiplied by zero is the single digit number zero (0).
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QuestionHow would I do 18 x 18?Community AnswerMaybe, in my opinion, use a calculator which would be way easier! just type up 18 times 18 and it will come! For example, 18 times 18 is 324.
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QuestionCan someone explain how carrying with multiplication works when both numbers are double digits?Community AnswerMostly because there are tenths and ones, and carrying helps you putting digits in their place where they belong.
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QuestionHow would you solve three by two multiplication?DonaganTop AnswererLet the three-digit number be the multiplicand (on the top) and the two-digit number be the multiplier (on the bottom) so that you'll have only two partial products to add together.
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QuestionHow do we find the divisors of 124?Community AnswerYou're probably asking about the factors of 124. You find them by dividing small numbers into 124 and seeing which of them will divide evenly without a remainder. The small numbers which divide evenly into 124 are 1, 2 and 4. When you divide each of those numbers into 124, you get quotients of 124, 62 and 31, respectively. That means the factors (divisors) of 124 are 1, 2, 4, 31, 62 and 124. (Remember that a number's factors (divisors) always include 1 and the number itself.)
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