adding friendly numbers grade 4. are numbers that have 0’s in the tens like 30 or 50 hundreds like...
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![Page 1: 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](https://reader036.vdocuments.mx/reader036/viewer/2022062307/551ac8f95503466b6a8b50cc/html5/thumbnails/1.jpg)
Adding Friendly Numbers
Grade 4
![Page 2: 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](https://reader036.vdocuments.mx/reader036/viewer/2022062307/551ac8f95503466b6a8b50cc/html5/thumbnails/2.jpg)
are numbers that have 0’s in the
Tens like 30 or 50
Hundreds like 100 or 300
Thousands like 3000 or 6000
![Page 3: 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](https://reader036.vdocuments.mx/reader036/viewer/2022062307/551ac8f95503466b6a8b50cc/html5/thumbnails/3.jpg)
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
![Page 4: 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](https://reader036.vdocuments.mx/reader036/viewer/2022062307/551ac8f95503466b6a8b50cc/html5/thumbnails/4.jpg)
198343
198 +2 =200 (a friendly number)
Subtract 2 to become 341
Now add it all up
200341541
![Page 5: 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](https://reader036.vdocuments.mx/reader036/viewer/2022062307/551ac8f95503466b6a8b50cc/html5/thumbnails/5.jpg)
205549
205 -5 =200 (a friendly number)Add 5 to 549 to become 554
Now add it all up
200554754
![Page 6: 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](https://reader036.vdocuments.mx/reader036/viewer/2022062307/551ac8f95503466b6a8b50cc/html5/thumbnails/6.jpg)
508383
508 -8 to become 500 (a friendly number)
Add 8 to become 391
Now add it all up
500391891
![Page 7: 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](https://reader036.vdocuments.mx/reader036/viewer/2022062307/551ac8f95503466b6a8b50cc/html5/thumbnails/7.jpg)
876313
Add 13 to become 889
Subtract 13 to become 300
Now add it all up
889300
1 1 89
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850508
Add 8 to become 858
Subtract 8 to become 500
Now add it all up
858500
1 3 58
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89213
Add 11 to become 100
Subtract 11 to become 202
Now add it all up
100202
302
![Page 10: 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](https://reader036.vdocuments.mx/reader036/viewer/2022062307/551ac8f95503466b6a8b50cc/html5/thumbnails/10.jpg)
![Page 11: 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](https://reader036.vdocuments.mx/reader036/viewer/2022062307/551ac8f95503466b6a8b50cc/html5/thumbnails/11.jpg)
482295 Add 5 to become 300
Now add it all up to make 782
482300782
Now Subtract 5 to become 777 7 77
![Page 12: 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](https://reader036.vdocuments.mx/reader036/viewer/2022062307/551ac8f95503466b6a8b50cc/html5/thumbnails/12.jpg)
859508
Add 8 to become 1367
Subtract 8 to become 500
Now add it all up
859500
1 3591 367
![Page 13: 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](https://reader036.vdocuments.mx/reader036/viewer/2022062307/551ac8f95503466b6a8b50cc/html5/thumbnails/13.jpg)
4780 Add 5 to become 4785
Subtract 5 to become 2000
Now add it all up
2005
47852000
5876
![Page 14: 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](https://reader036.vdocuments.mx/reader036/viewer/2022062307/551ac8f95503466b6a8b50cc/html5/thumbnails/14.jpg)
The End – now do your own on the next slide!
![Page 15: 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](https://reader036.vdocuments.mx/reader036/viewer/2022062307/551ac8f95503466b6a8b50cc/html5/thumbnails/15.jpg)
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?