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Multiplication Using the Lattice Method

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What’s It All About? You are going to learn: How to multiply two whole numbers. What skills should you have already? You need to be able to multiply up to 9 9 and add single digit numbers.

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Multiplication Using Lattice Demo Calculate 572 × 14 Draw a box. You need three squares across and two squares down. Because 5 7 2 has three digits and 1 4 has two digits…

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Cut each square diagonally in half. Write the numbers to be multiplied around the top and right edges. Use a highlighter pen to highlight every other diagonal stripe. 5 7 2 Multiplication Using Lattice Demo 1 4

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Multiply the digits at the top and right of each cell and write the answer in the cell. 5 7 2 Multiplication Using Lattice Demo 1 4 0 5 0 7 0 2 0 2 8 0 8 Ten Thousands Thousands UnitsHundreds Tens The digits in each diagonal stripe all have the same place value...

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Add up each stripe. Write the total for each stripe at the end of the stripe. 5 7 2 Multiplication Using Lattice Demo 1 4 0 5 0 7 0 2 0 2 8 0 8 Ten Thousands Thousands UnitsHundreds Tens Now we add up the digits, starting with the units corner...

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Add up each stripe. Write the total for each stripe at the end of the stripe. 5 7 2 Multiplication Using Lattice Demo 1 4 0 5 0 7 0 2 0 2 8 0 8 0 8 0 8 0 1 1 Always write down your answer... 572 × 14 = 8008

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Question 1 (with answer) Calculate 76 × 21 7 6 2 1 1 5 9 76 × 21 = 1596 1 4 1 2 0 7 0 6 6

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Question 2 (with answer) Calculate 152 × 34 1 5 2 3434 0 3 1 5 0 6 0 4 2 0 8 0 5 68 1 1 152 × 34 = 5168

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Question 3 (with answer) Calculate 237 × 14 2 3 7 1414 0 2 0 3 0 7 0 8 1 2 8 0 3 1 8 3 1 237 × 14 = 3318 1

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Your Turn 1532 × 65 263 × 51 3234 × 97 4 7165 × 4 537 × 45 6103 × 54

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Decimal Review. Adding decimals 8.12 + 14 + 32.9 Rules 8.12 14 + 32.9 8.12 14 +32.9 1. Line up the decimal points 2. Make whole numbers look like decimals.

Decimal Review. Adding decimals 8.12 + 14 + 32.9 Rules 8.12 14 + 32.9 8.12 14 +32.9 1. Line up the decimal points 2. Make whole numbers look like decimals.

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