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You have to pay £87 per week for your rent. You have to pay the rent for 51 weeks of the year. How much will you pay over the year?
To work this out we need to:To work this out we need to: –Multiply 87 by 51 We can do this using ‘the lattice method’
87 5 1 First draw a box Write one number across the top Write one number down the side
87 5 1 Split the box into 1 row and 1 column for each number Draw a diagonal line in each of the boxes
87 5 1 8 x 5 = ? Multiply the two numbers that meet In each box
87 5 1 0 4 7 x 5 = ? Write the answer in the box Put the tens in top half the units in the bottom
87 5 1 4 0 8 x 1 = ? 3 5 Write the answer in the box Put the tens in top half the units in the bottom
87 5 1 0 4 5 3 0 8 7 x 1 = ? Write the answer in the box Put the tens in top half the units in the bottom
87 5 1 0 4 5 3 0 87 0 Write the answer in the box Put the tens in top half the units in the bottom
87 5 1 0 4 5 3 0 87 0 We can ignore the numbers outside for now
0 4 5 3 0 87 0 Add the numbers in the diagonal columns Remember to start at the right hand side 7 31 4 4 If the number is more than 10 carry into the next row
87 5 1 0 4 5 3 0 87 0 87 x 51 = 4437 7 3 4 4 x
You have to pay £87 per week for your rent. You have to pay the rent for 51 weeks of the year. How much will you pay over the year? £4,437
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