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Parents Guide to Subtraction

Parents Guide to Subtraction. This Power Point Presentation will Show Parents the Language We Use When Teaching Children Subtraction Using Decomposition. Organising numbers:. We organise numbers in columns like this: H T U Hundreds Tens Units

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Parents Guide to Subtraction

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  1. Parents Guide to Subtraction This Power Point Presentation will Show Parents the Language We Use When Teaching Children Subtraction Using Decomposition.

  2. Organising numbers: We organise numbers in columns like this: H T U Hundreds Tens Units Only a single figure can go into each column.

  3. Count up to 9 9 H T U The units column is now full. You can only put one digit in each column. To make 10 we need to move to the next column.

  4. The Tens Column 3 0 H T U We have 3 in the tens column and nothing in the units column. The number is 30.

  5. The Hundreds Column 3 0 0 H T U We have 3 in the hundreds column and nothing in the tens or the units column. The number is 300.

  6. Understanding Hundreds Tens and Units 3 1 9 H T U The number 319 is: 3 hundreds 1 ten 9 units

  7. How to Take Away Make sure the biggest number is on the top line. 305 - 24 ---------

  8. Begin in the Units column. Say: 5 take away 4 is 1 H T U 3 0 5 2 4 ------------ 1 How to Take Away

  9. Move to the Tens column. Say: 0 take away 2 You have nothing – so you can’t take away 2! We need to EXCHANGE. H T U 3 0 5 2 4 ------------ 1 How to Take Away

  10. You have to take 1 out of the hundreds column. H T U 3 0 5 2 4 ------------ 1 How to Take Away: Exchanging Remember: You are taking 100 out of the hundreds column. 100 is the same as 10 tens! X 1 2 Now we have 2 hundreds and 10 tens!

  11. Now we say: 10 take away 2 is 8 H T U 3 0 5 2 4 ------------ 1 We Exchanged 1 Hundred for 10 Tens 2 1 X There is no digit below the 2 in the hundreds column so we say: 2 take away 0 is 2. Answer: 281 2 8

  12. Exchanging When the digit on the top line is smaller than the digit on the bottom line we say: ‘We need to exchange.’

  13. One More Example H T U 5 6 7 • 3 2 9 ------------

  14. 7 is smaller than 9. You have to take 1 out of the tens column. H T U 5 6 7 3 2 9 ------------ 8 One More Example Remember: You are taking 10 out of the tens column. So the 7 becomes 17. X 1 5 Now we have 17 units and 5 tens!

  15. Now we say: 5 take away 2 is 3. H T U 5 6 7 3 2 9 ------------ 8 One More Example 5 1 X Move to the hundreds column. Say: 5 take away 3 is 2. Answer: 238 2 3

  16. 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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