Math-OR-DY

Addition

100

987987+7897=

995,884

200

7990+4399=

12,389

300

789+276=

1,065

400

2397+8113=

10,510

500

1667+1995=

3,662

Subtraction

100

There were 396,123 items. Then 127,288 of them were sold. How many were NOT sold?

 396,123

-127,288

__________

268,835

200

80,000-5,299=

74,701

300

170-89=

81

400

51082-17176=

33,906

500

700-250=

450

Rounding

100

9179 to nearest hundreds

9200

200

9259 to nearest tens

9260

300

1050 to nearest hundreds

1100

400

4593 to nearest thousands

5000

500

17809 to nearest thousands

18,000

Estimate

100

estmate to solve 287+558

300+600=900

200

estimate to solve 1200+1600

1000+2000+3000

300

estimate 

280 +182

300+200=500

400

estimate to solve 805+412

800+400=1200

500

345+780=

300+800=1100

Strategies

100

I can use this strategy by only writing the numbers and operation down on my paper (working it out with pencil and paper).

Algorithm

200

If I want to make units, rods, and flats on my paper, the strategy I am using is....

Draw a picture/model

300

I can figure out the answer by changing 325 plus 259 to: 300+200+20+50+5+9=

Decomposing numbers (break it down)

400

I can do this problem in my head like on mad minute.

mental math

500

I can use this strategy when i have the total and one part. or if I have 2 parts and need the whole.

Strip Diagram