topic 2 review

estimate

100

Problem #1

4,000 + 1,000+ 4,000 = 9,000 hot dogs

zeroes

100

Problem #2

1,720

missing number

100

#3

3 and 9

subtraction

100

#4

c

200

#6

9,392

300

#7

1st, 3rd and 5th

400

#10 part A and b

A. 1219+4620=5,839

1,906+ 4,287=6,193

6,193-5,839=354 more

b. 400 birds is close to 354 so my answer is reasonable

adding

100

#5

13,432

200

#8

17,991