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Published byStephan Catchpole Modified over 2 years ago

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

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

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

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

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

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

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

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

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

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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: ( =1358) ( =302) ( =1189) ( =1022) How did you do?

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