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Adding Friendly Numbers Grade 4

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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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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

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198 343 198 + 2 =200 (a friendly number) Subtract 2 to become 341 Now add it all up 200 341 541

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205 549 205 -5 =200 (a friendly number) Add 5 to 549 to become 554 Now add it all up 200 554 754

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508 383 508 -8 to become 500 (a friendly number) Add 8 to become 391 Now add it all up 500 391 891

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876 313 Add 13 to become 889 Subtract 13 to become 300 Now add it all up 889 300 1 89

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850 508 Add 8 to become 858 Subtract 8 to become 500 Now add it all up 858 500 1 358

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89 213 Add 11 to become 100 Subtract 11 to become 202 Now add it all up 100 202 302

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482 295 Add 5 to become 300 Now add it all up to make 782 482 300 7 8 2 Now Subtract 5 to become 777 77 7

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859 508 Add 8 to become 1367 Subtract 8 to become 500 Now add it all up 859 500 1 3 5 9 67

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4780 Add 5 to become 4785 Subtract 5 to become 2000 Now add it all up 2005 4785 2000 5876

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

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Now do these on your own paper: 1. 850 + 508 2. 89 + 213 3. 876 + 313 4. 226 + 796 (858 + 500=1358) (100 + 202=302) (889 + 300 =1189) (222 + 800=1022) How did you do?

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