# 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 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:

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

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

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

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

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

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

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

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

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

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

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

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?

Similar presentations