Show:
word problems
ball park estimate/then solve
partial sums
expanded form
mentally add/subtract 10 or 100
100

Fish E is 50 inches long, Fish F is 30 inches long. How much longer is Fish E than Fish F?

Quanity/Quanity Difference

50-30=?

30+?=50

Fish E is 20 inches longer than Fish F

100

Make a ball park estimate then choose a method to solve. (partial sums, base ten, open number line)

39+47

40+50=90 Ball park

86

100

Solve using partial-sums addition. Show your work.

   27

+42

_______

7+2=9

20+40=60

__________

60+9=69

100

Write the number in expanded form.

345

300+40+5

100

26+10=____

36

200

Fish E is 60 inches long, Fish F is 30 inches long. How much longer is Fish E than Fish F?

60-30=?

30 inches

200

Make a ball park estimate then choose a method to solve. (partial sums, base ten, open number line)

38+41=

40+40=80 ball park

79

200

Solve using partial-sums addition. Show your work.

62+32

2+2=4

60+30=90

______

90+4=94

200

Write the number in expanded form.

299

200+90+9

200

435+10=____

445

300

Fish B is 80 inches long, Fish A is 10 inches long. How much longer is Fish B than Fish A?

80-10=?

70 inches

300

Make a ball park estimate then choose a method to solve. (partial sums, base ten, open number line)

52+29=

50+30=80 ball park

81

300

Solve using partial-sums addition. Show your work.

72+28=

2+8=10

70+20=90

_________

90+10=100

300

Write the number in expanded form.

506

500+6

300

786=____+100

686

400

Sam needed 30 juice boxes for her class party. She bought 33. How many extra juice boxes did she have?

30+?=33

33-30=?

3 juice boxes

400

Make a ball park estimate then choose a method to solve. (partial sums, base ten, open number line)

46+28=

50+30=80

74

400

Solve using partial-sums addition. Show your work.

29+86=

9+6=15

20+80=100

_______

100+15=115

400

Write the number in expanded form.

711

700+10+1

400

534=634-___

100

500

The horse is 10 feet tall while standing. Its legs are 3 feet long. How tall is the horse when lying down?

10-3=?

3+?=10

7 feet

500

Make a ball park estimate then choose a method to solve. (partial sums, base ten, open number line)

35+76

40+80=120

111

500

Solve using partial-sums addition. Show your work.

82+14=

4+2=6

80+10=90

________

90+6=96

500

Write the number in expanded form.

601

600+1
500

234-10=

224