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Base 10
Partial Sums/Differences
Standard Algorithm
Missing Addends
Word Problems
100

How many ones make up a ten?

10 ones make a ten

100

What is 682 in expanded form (strrreeeetch it out)

600+80+2

100

25+24

25+24=49

100

13+___=30

13+17=30

100

Mrs. Connolly buys stickers for school. She has 205 round stickers and 197 smelly stickers. How many total stickers does Mrs. Connolly have for school?

205 + 197 = 402 stickers

200

How many hundreds are in 248?

2 hundreds

200

Use the Partial Sums strategy to solve 37+29

37=30+7, 29=20+9

7+9=16, 30+20=50

16+50=66

200

651+284

651+284=935

200

56 - ___ = 32

56-24=32

200

Mrs. Summers had 362 books and she donated 148 books to the library. What is the difference between the number of books Mrs. Summers had and the number of books she donated? 

362-148 = 214 books

300

Use a Base 10 model/drawing to solve 47+31

Does your teacher approve your model/drawing? 

Answer = 78

300

Use Partial Differences to solve 695-496

695=600+90+5, 496=400+90+6

Regroup a ten to make 15 ones, 15-6=9

Regroup a hundred to make 18 tens, 180-90=90

500-400=100, 100+90+9=199

300

612-361

612-361=251

300

411 + 362 = 7__3

411 + 362 = 773

300

An apple orchard sold 627 red apples and 399 green apples. How many apples were sold in all?

627+399=1,026 apples

400

Use a Base 10 model/drawing to solve 420-263

Does your teacher approve your model/drawing? 

Answer = 157

400

Use Partial Differences to solve 714-386

714=700+10+4, 386=300+80+6

Regroup a ten to make 14 ones, 14-6=8

Regroup a hundred to make 10 tens, 100-80=20

600-300=300, 300+20+8=328 

400

400-263

400-263=137

400

368 - 259 = 10__

368 - 259 = 109

400

An apple orchard sold 500 red apples and 278 green apples. What is the difference in the number of red apple and green apples sold at the orchard?

500 - 278 = 222 apples

500

Use a Base 10 model/drawing to EXPLAIN the answer to 508-219

Does your teacher approve your EXPLANATION? 

Answer = 289

500

Find the error(s) in the following problem.

416-209

400+10+6, 200+0+9

6-9=3, 10-0=10, 400-200=200

416-209=200+10+3=213

You cannot subtract 6-9 so you must regroup a ten.

500

Use the Standard Algorithm to explain how to solve 360-172.

You cannot subtract 2 ones from 0 so you need to regroup a ten and make 10 ones. 10-2 = 8. After borrowing a ten, there are 5 tens remaining and you cannot take 7 away. You need to regroup a hundred and make 15 tens. 15 tens-7 tens=8 tens. After borrowing a hundred, there is 2 hundreds left. If you take one hundred away, there is 1 hundred left. The answer is 188.
500

279 + 1__3 =  442

279 + 163 =  442

500

Mrs. Keenon stapled 184 papers in August and 176 papers in September. How many papers did Mrs. Keenon staple in all? Explain your thinking with words and numbers.

184+176=360 stapled papers; When 4 ones and 6 ones are added together it makes a new ten and there would be 0 ones remaining. 8 tens plus 7 tens, plus the new ten would me 16 tens. 10 tens make a new hundred and 6 tens would remain. 1 hundred plus another hundred, plus the new hundred would make 3 hundreds; 3 hundreds plus 6 tens plus 0 ones equals 360 papers.