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100

45 + 37

82

100

85 - 24

61

100

40 + 2

42

100

325 + 498

answers will vary

300 + 500 = 800 (rounding)

325 + 500 = 825 (compatible numbers)

300 + 400 = 700 (front end)

100

Katie has $255 and received $550. How much money does she have altogether?

Katie has $805.

200

246 + 365

611

200

382 - 45

337

200

200 + 30 + 7

237

200

207 + 387

answers will vary

200 + 400 = 600 (rounding)

200 + 300 = 500 (front end)

200

Luke has $47 and spens $13 at the shop. How much money does he have left?

He has $34 left. 

300

789 + 99

888

300

554 - 298

256

300

800 + 9

809

300

578 + 245

answers will vary

600 + 200 = 800 (rounding)

500 + 200 = 700 (front end)

550 + 250 = 800 (compatible numbers)

300

Jesse has 145 stickers. Paul has 106 stickers. Todd has 78 stickers. How many stickers do they have in all?

They have 329 stickers in all. 

400

2459 + 4581

7040

400

5406 - 2034

3372

400

4000 + 90 + 8

4098

400

476 + 321 

answers will vary

500 + 300 = 800 (rounding)

400 + 300 = 700 (front end)

450 + 320 = 770 (compatible numbers)

400

Michael has $2316. He buys an XBox for his son that costs $345. How much money does he have left?

He has $1971 left. 

500

9999 + 9999

19 998

500

7891 - 2875

5016

500

10 000 + 4000 + 300 + 80

14 380

500

761 + 899

answers will vary

800 + 900 = 1700 (rounding)

700 + 800 = 1500 (front end)

750 + 900 = 1650 (compatible numbers)

500

Chris has 250 candy. He gave 125 to Maggie and 65 to Nancy. How many candy does he have left?

He has 60 candy left.