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Published byKatherine Lambdin Modified over 2 years ago

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Double Digit X Single Digit Multiplication There are 89 jellybeans in each jar. How many jellybeans are there in all? Tens Ones 2 8 9 X 3 2 6 7 I know that I can use multiplication for this problem because each jar contains an equal amount of jellybeans. Step 1: Multiply the factors in the ones column. 3 x 9 = 27 Place the seven ones in the ones column. Regroup the 2 tens. Place the 2 in the tens column. Step 2: Multiply the factor in the ones column by the factor in the tens column. 3 X 8 = 24 Step 3: Add the 2 groups of ten to the product 24. 24 + 2 = 26 You can also break larger numbers down before multiplying. Example: Then, add the products for the answer. 8 9 80 X 3 = 240 2 4 0 x 3 9 X 3 = 27 + 2 7 2 6 7 2 6 7

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Division with Remainders Some vocabulary that you need to know to help you with division: dividend – A dividend is the total number of items that are being divided. Example: 201 pencils in all divisor - A divisor is the number of items that are in each group. Example: 5 pencils in each group quotient – A quotient is the answer in a division number sentence. It tells the number of equal groups that the dividend is being broken into. Example: 40 groups of pencils remainder – A remainder is the number of items that are left over or remaining. They are left over because there are not enough of them to make a complete group. Example: One pencil is left over. *Remember each group must have 5 pencils in it, so 4 more pencils are needed to make a complete group. Example: There are 201 pencils that are going to be shared equally by 5 children. How many pencils does each child get? __40 R1 (quotient) (divisor) 5 ) 201 (dividend) - 200 1 Answer: Each child gets 40 pencils. There is 1 extra pencil.

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Checking Division with Multiplication *Check your division work with a multiplication number sentence. Let’s use the pencil problem from the previous slide. __40 R1 (quotient) (divisor) 5 ) 201 (dividend) - 200 1 We can check to see if 40 R1 is the quotient with a multiplication number sentence. To do this, first take the quotient and multiply it by the divisor. 40 groups of pencils x 5 pencils in each group 200 pencils (product) Then, remember to add the remainder to the product. 200 pencils + 1 pencil 201 pencils Yes! Our answer checks out!

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Partial Quotient Method In this division algorithm the children record on the right side of the problem. The first thing they do is divide. They ask themselves.

Partial Quotient Method In this division algorithm the children record on the right side of the problem. The first thing they do is divide. They ask themselves.

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