Use Partial Sums to Add
Use partial sums to add...
128 + 441
100 + 400 = 500
20 + 40 = 60
8 + 1 = 9
500 + 60 + 9 = 569
220 + 479
699
627 + 98
725
36 + 27 + 45
108
Use partial sums to solve...
516 + 142
500 + 100 = 600
10 + 40 = 50
6 + 2 = 8
600 + 50 + 8 = 658
283 + 147
430
576 + 416
991
135 + 246 + 321
702
Use partial sums to solve ...
580 + 315
500 + 300 = 800
80 + 10 = 90
0 + 5 = 5
800 + 90 + 5 = 895
542 + 109
651
234 + 277
511
245 + 315 + 328
888
Bill needs to find 318 + 230. Into what three smaller problems can Bill break this addition problem? What is the sum?
300 + 200 = 500
10 + 30 = 40
8 + 0 = 8
548
669 + 237
906
Paige says that when you add 467 to 258 you only need to regroup once. Connor says you need to regroup two times. Who is correct?
Connor! You have to regroup the ones and tens!
234 + 67 + 211 + 305
817