Show:
Finding the Sum!
Subtracting!
Two Step Problems!
Knowing the Strategy!
Vocabulary & Expanded Form!
100

Use a strategy to find 153+124

277

100

Use a strategy to find 255-131

124

100

Find 109+38. Then subtract from 300.

109+38=147

300-147=153

100

What method of adding/subtracting does Miss. Whitt never want to see us using? 

Stacking!

100

If I see the word "sum" in the problem...that means I should.....

Add!

200

Use a strategy to find 308+275

583

200

Use a strategy to find 400-257

143

200

Find 211+108. Then subtract from 400.

211+108=319

400-319=81

200

What THREE strategies can I use for adding? 

Number Lines, Place Value Blocks, Expanded Form

200

When a problem asks me to "find the difference...", that means I need to...

Subtract!

300

Use a strategy to find 104+163+78

345

300

Use a strategy to find 500-309

191

300

Find 215+168+46. Then subtract from 500. 

215+168+46=429

500-429=71

300

What TWO strategies can I use for subtracting?

Place Value Blocks and Number Lines!
300
Which addends are broken apart correctly? 

a) 123 + 34 -> (100 +20)+(30)+(3+4)

b) 328 + 244 -> (300 +200)+(20+40)+(8+4)

c) 215 + 309 -> (200)+(10)+(5+9)

d) 119 + 276 -> (100+70)+(200+10)+(9+6)

b) 328 + 244 -> (300 +200)+(20+40)+(8+4)