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Parents Guide to Long Multiplication

Parents Guide to Long Multiplication. This Power Point Presentation will Show Parents the Language We Use When Teaching Children Long Multiplication. Introducing Long Multiplication. We introduce long multiplication first of all by looking at multiplying by 20, 30, 40 etc. Example

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Parents Guide to Long Multiplication

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  1. Parents Guide to Long Multiplication This Power Point Presentation will Show Parents the Language We Use When Teaching Children Long Multiplication

  2. Introducing Long Multiplication We introduce long multiplication first of all by looking at multiplying by 20, 30, 40 etc. Example 54 62 X20x30

  3. Always multiply by the units first: 54 X 20 We say, “54 multiplied by zero.” Then we say, “54 multiplied by 2.”

  4. Multiplying by 20 We introduce this calculation by saying: 54 multiplied by zero is zero. When we multiply by zero the answer is always zero! Put your zero in the answer. Now we multiply 54 by 2. We say 2 fours are 8. Put down your 8. Now we say 2 fives are 10. This is the end of the sum so put down the 10 in the answer. 5 4 x 20 10 0 8

  5. Example 2 We introduce this calculation by saying: 46 multiplied by zero is zero. When we multiply by zero the answer is always zero! Put your zero in the answer. Now we multiply 46 by 2. We say 2 sixes are 12. Put down your 2 and carry your 1. Now we say 2 fours are 8 add 1 is 9. This is the end of the sum so put down the 9 in the answer. 4 6 x 20 9 0 1 2

  6. Remember: when we multiply by zero, the answer is always zero! Try These:

  7. Long Multiplication Long multiplication is really 3 sums in one! Step 1: multiply the top number by the units digit in the bottom number. Step 2: Multiply the top number by the tens digit in the bottom number. Step 3: add your two answers.

  8. Be careful with your place value! • To remind us to keep the figures in the correct place, we talk about the magic 0! • 46 • X23 • 138 Multiply 46 by 3 • 920 Put in your magic nought! Now do 46 multiplied by 2 • Finally add your two answers together! • Notice that without your magic nought the digits 9 and 2 would not be in the correct place & your answer would be incorrect.

  9. Now try these: Remember: Long multiplication is really 3 sums in one! Step 1: multiply the top number by the units digit in the bottom number. Step 2: Multiply the top number by the tens digit in the bottom number. Step 3: add your two answers.

  10. Click Below to Return to Our School Website. We hope this powerpoint will help you to work with your child at home. Please ask in school if you have any questions regarding our approach to teaching maths. http://www.killeanps.com

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