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Adding Friendly Numbers Grade 4. are numbers that have 0’s in the Tens like 30 or 50 Hundreds like 100 or 300 Thousands like 3000 or 6000.

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Presentation on theme: "Adding Friendly Numbers Grade 4. are numbers that have 0’s in the Tens like 30 or 50 Hundreds like 100 or 300 Thousands like 3000 or 6000."— Presentation transcript:

1 Adding Friendly Numbers Grade 4

2 are numbers that have 0’s in the Tens like 30 or 50 Hundreds like 100 or 300 Thousands like 3000 or 6000

3 We can change numbers into so that they are easier to add in our heads! Follow this simple rule: You can change numbers if they: Are close to a ten, hundred or thousand

4 =200 (a friendly number) Subtract 2 to become 341 Now add it all up

5 =200 (a friendly number) Add 5 to 549 to become 554 Now add it all up

6 to become 500 (a friendly number) Add 8 to become 391 Now add it all up

7 Add 13 to become 889 Subtract 13 to become 300 Now add it all up

8 Add 8 to become 858 Subtract 8 to become 500 Now add it all up

9 Add 11 to become 100 Subtract 11 to become 202 Now add it all up

10

11 Add 5 to become 300 Now add it all up to make Now Subtract 5 to become

12 Add 8 to become 1367 Subtract 8 to become 500 Now add it all up

13 4780 Add 5 to become 4785 Subtract 5 to become 2000 Now add it all up

14 The End – now do your own on the next slide!

15 Now do these on your own paper: ( =1358) ( =302) ( =1189) ( =1022) How did you do?


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