Using multiplication and written methods ©www.icoachmaths.co.uk2015.

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Presentation transcript:

Using multiplication and written methods ©

Remember that 6 ÷ 3 means “how many threes make 6?” Division is the INVERSE of Multiplication (This means it reverses multiplication) There are different ways of showing division. 6 ÷ 3 The answer is the same in all three cases! Division ©

For multiplying, we use this grid: We can now use it to divide as well as multiply!!! Example 20  4 means How many 4’s make 20? Using Multiplying to Divide The answer is 5 !! Find 20 in the fours row fours make 20 so.... ©

For multiplying, we use this grid: We can now use it to divide as well as multiply!!! Example 20  4 means How many 4’s make 20? Using Multiplying to Divide The answer is still 5 !! Or find 20 in the fours column.... ©

Remember that 6 ÷ 3 means “how many threes make 6?” Use the grid to work out: 16 ÷ 4 30 ÷ 5 18 ÷ 2 45 ÷ 9 72 ÷ 8 21 ÷ 3 21 ÷ Your Turn = 4 = 6 = 9 = 5 = 9 = 7 = 3 ©

Bigger Numbers What about bigger numbers that are not in a multiplication grid? There are various methods you can use. Find one you like and stick to it! Here are some of the more common ones: ©

Work out £192 ÷ 6 Set up the method: Multiply 6 by eg 10, then subtract 10 Repeated Subtraction Repeat this method until your green number is 0 or a number less than 6. Total the last column = 32 There is no “wrong” number to multiply by – but it will be quicker if you choose wisely! ©

Work out £128 ÷ 8 Set up the method: Multiply 8 by something easy such as 10, then subtract 10 Repeated Subtraction Repeat this method until your green number is 0 or a number less than 8. = 16 ©

If you know your tables, you can split the number up into useful parts: Work out 654  6 Remember6  6 = 1 60  6 =  6 = 100 Use this split 600 Partitioning 6 is in the 6 times table and so is  6 = 109  6 = 100  6 = 9 ©

Partitioning Work out 924  4 Use this split: 800  4 =  4 = 30 4  4 =  4 = is not in the 4 times table, but 8 is... ©

Find the answer to £84 ÷ 4 Set up the division: Think of this as 8 tens to share between 4 people. How many do they get each? 2 Traditional Short Division 4 “ones” to be shared between 4 people. How many do they each get? 1 = 21 ©

Find the answer to 468 ÷ 9 Set up the division: You cannot share 4 hundreds between 9, so change them to tens and carry 46 tens can be shared between 9 -› 5 with 1 left over -> change the 1 ten to units and carry across Traditional Short Division ©

Find the answer to 468 ÷ 9 Set up the division: How many 9’s make 18? Traditional Short Division 2 = 52 ©

Work out: 164 ÷ ÷ ÷ ÷ ÷ ÷ ÷ ÷ 17 Your Turn Pause while you have a go at these.... = 41 = 21 = 304 = 51 = 13 = 63 = 754 = 12 Ready...? ©

Work out: 728 ÷ ÷ ÷ ÷ ÷ ÷ ÷ 11 More practice = 91 = 73 = 107 = 63 = 219 = 15 = 21 Pause while you have a go at these.... Ready...? ©

The End © Ciao for now…