Multiplication Using the Lattice Method Whats It All

Multiplication Using the Lattice Method

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.

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…

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

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

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

Multiplication Using Lattice Demo Add up each stripe. Write the total for each stripe at the end of the stripe. 5 0 0 8 21 Always write down your answer. . . 7 0 5 0 0 2 1 2 0 7 0 8 0 2 8 8 572 × 14 = 8008 1 4

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

Question 2 (with answer) Calculate 152 × 34 1 0 51 5 0 0 1 3 0 5 2 4 1 2 6 0 8 0 6 3 4 8 152 × 34 = 5168

Question 3 (with answer) Calculate 237 × 14 2 0 0 3 3 0 2 1 0 18 3 3 1 0 7 7 2 8 2 1 1 4 8 237 × 14 = 3318

Your Turn 1 532 × 65 2 63 × 51 3 234 × 97 4 7165 × 4 5 37 × 45 6 103 × 54

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