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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
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
=200 (a friendly number) Subtract 2 to become 341 Now add it all up
=200 (a friendly number) Add 5 to 549 to become 554 Now add it all up
to become 500 (a friendly number) Add 8 to become 391 Now add it all up
Add 13 to become 889 Subtract 13 to become 300 Now add it all up
Add 8 to become 858 Subtract 8 to become 500 Now add it all up
Add 11 to become 100 Subtract 11 to become 202 Now add it all up
Add 5 to become 300 Now add it all up to make Now Subtract 5 to become
Add 8 to become 1367 Subtract 8 to become 500 Now add it all up
4780 Add 5 to become 4785 Subtract 5 to become 2000 Now add it all up
The End – now do your own on the next slide!
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