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Published byMervyn Casey Modified over 4 years ago

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Multiplying by 2-digit factors Partial Products

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How can we multiply 23 × 15 1.Draw a box and divide it into four pieces. 2.Write the value of each digit in the number 23 across the top. Then write the value of each digit in the number 15 on the side of the box. 203 10 5

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How can we multiply 23 × 15 3. Multiply the two numbers that meet in each box. 203 10 5 20030 10015

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How can we multiply 23 × 15 4. Add of the 4 products that are in the boxes together. 203 10 5 20030 10015 200 100 30 + 15 345

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How can we multiply 23 × 15 23 × 15 = 345 203 10 5 20030 10015 200 100 30 + 15 345

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Multiply 47 × 24 1. Draw your box 2. Label the box 407 20 4 3. Multiply 800140 16028 4. Add 800 160 140 + 28 1128

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Multiply 73 × 46 1. Draw your box 2. Label the box 703 40 6 3. Multiply 2800120 42018 4. Add 2800 420 120 + 18 3358

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Multiply 37 × 18 307 10 8 30070 24056 300 240 70 + 56 666

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Try the following problems on your own in your math journal. 1.63 × 54 2.95 × 37 3.46 × 83 4.27 × 62

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