3 digit Addition
300 + 205 =
505
(12 + 15) + 8 =
12 + (15 + 8)
35
124 + 356 =
356 + 124
480
145 + 0 =
145
325 - 112 =
213
250 + 600 =
850
(24 + 30) + 10 =
24 + (30 + 10)
64
213 + 450 =
450 + 213
663
236 + 0 =
236
471 - 253 =
218
175 + 520 =
695
What is the associative property?
Grouping numbers with parentheses in any order
(10 + 15) + 5 = 10 + (15 + 5)
What is the commutative property?
Re-ordering the numbers does not change the sum
10 + 5 = 5 + 10
512 + 0 =
512
608 - 294 =
314
327 + 473 =
800
(45 + 20) + 15 =
45 + (20 + 15)
80
372 + 189 =
189 + 372
561
378 + 0 =
378
752 - 436 =
316
257 + 684 =
941
(132 + 18) + 25 =
132 + (18 + 25)
175
508 + 276 =
276 + 508
784
What is the identity property?
Adding 0 to any number will keep the number the same
100 + 0 = 100
845 - 579 =
266