Year 5 - Numeracy Title page.

        Year 5 - Numeracy Long Multiplication Title page.

and follow this example. Oh no! I can’t do long multiplication. What am I going to do? Don’t panic! Take it step by step and follow this example. The problem.

23 x 14 When multiplying these two numbers together, it is easier to put them into a grid. The question.

partition the numbers into The first thing to do is partition the numbers into tens and units. 23 x 14 20 3 10 Multiplication grid. 4

23 x 14 20 3 200 30 10 80 12 4 Multiply the number above the box with that on the left, writing the answer inside the box, as shown below. 23 x 14 20 3 200 30 10 Multiplication grid. 80 12 4

23 x 14 20 3 200 10 30 230 4 80 12 92 The next step is to add up the rows, putting the answer in the boxes on the right. 23 x 14 20 3 200 10 30 230 Multiplication grid. 4 80 12 92

23 x 14 20 3 200 10 30 230 4 80 12 92 322 Now add up the totals on the right to give the answer. 23 x 14 20 3 200 10 30 230 Finished grid. 4 80 12 92 322

This is a little different Now you can work out multiplication using the grid method, you will find long multiplication easy! This is a little different from the grid method, as the numbers are set out in columns… Introduction to long multiplication.

51 x 42 becomes 51 42 x Multiplication set out in columns.

multiply the tens of the top number with the tens Remember what we did using the grid method? 51 x 42 51 42 x The first thing to do, is multiply the tens of the top number with the tens and units of the bottom number. The first step.

multiplication you have 51 x 42 51 42 x 50 x 40 2000 50 x 2 100 Always write down the multiplication you have worked out next to the answer. The first step shown.

Next, multiply the units of the top number by the tens and units of the bottom number. 51 x 42 51 42 x 50 x 40 2000 50 x 2 100 The second step.

Don’t forget to write down the multiplication next to the answer. 51 x 42 51 42 x 50 x 40 2000 50 x 2 100 1 x 40 40 The second step shown. 1 x 2 2

The final step is to add up the column of numbers and put the total at the bottom. 51 x 42 51 42 x 50 x 40 2000 50 x 2 100 1 x 40 40 The answer. 1 x 2 2 2142

Try using long multiplication Now it's your turn Try using long multiplication to work out… Now it’s your turn. 25 x 62

25 x 62 becomes 25 62 x Example.

25 x 62 25 62 x x x Remember: The first step is to multiply the tens of the top number with the tens and units of the bottom number. Fill in the missing numbers.

25 x 62 25 62 x x 20 60 1200 x 20 2 40 x x The next step is to multiply the units of the top number by the tens and units of the bottom number. 25 62 x x 20 60 1200 x 20 2 40 x Second step. x

25 x 62 Now add up the totals and put them at the bottom. 25 62 x x 20 60 1200 x 20 2 40 x 5 60 300 Final step. x 5 2 10

25 x 62 25 62 x x 20 60 1200 x 20 2 40 x 5 60 300 Answer. x 5 2 10 1550

WELL DONE! You can now work out calculations using long multiplication. End.