Alice found 812-413=399 she added 812+399 to check her work. What did she do wrong?
They add up to 1824
721 - 224 + 63 = 560
It can be simplified to: 226x+672
813+813+812+808+806+805+804+804+804+803+802+796+792+792+783 =12037 All the operations are addition so all the adding can happen in one step.
The answer:812 The answer:812
If you take 537 and 812 and add them together, the sum is 1,349.
224 + 10 = 234
206.8 + 224 = 430.8
Alice found 812-413=399 she added 812+399 to check her work. What did she do wrong?
They add up to 1824
692
721 - 224 + 63 = 560
7/32 + 4/7 = 49/224 + 128/224 = 177/224
It can be simplified to: 226x+672
1.7 percent of 812 =13.804 1.7% of 812 = 1.7% * 812 = 1.7%/100% * 812 = 0.017 * 812 = 13.804
Basic mental arithmetic !... 224 !