# 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?

## Presentation on theme: "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?"— Presentation transcript:

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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