Topic 10 & 11

Addition

100

20 + 30 = _____

50

200

23 + 60 = _____

83

300

88 + 5 = _____

93

400

67 + 13 = ______

80

Subtraction

100

30 - 20 = ______

10

200

8 tens - 4 tens = ______ tens

80 - 40 = 40

4 tens!

300

Draw a picture of 70 - 20 = _____

7 tens sticks, cross off 2 sticks = 5 sticks left over

400

65 - 40 = ____

25

Hundreds Chart - Subtract

100

Use a hundreds chart to SUBTRACT:

30 - 20 = _______

start at 30, jump up 20 (2 jumps), answer is 10

200

Use a hundreds chart to SUBTRACT:

90 - 50 = _______

start at 90, jump back 50 (up 5), answer is 40

300

Use a hundreds chart to SUBTRACT:

60 - 20 = _______

start at 60, jump back 20 (up 2), answer is 40

400

Use a hundreds chart to SUBTRACT:

38 - 5 = _______

start at 38, go back 5 jumps, answer is 33

Hundreds Chart - Subtract

100

Use a hundreds chart to SUBTRACT:

70 - 30 = _______

start at 70, go back 30 (up 3), answer is 40

200

Use a hundreds chart to SUBTRACT:

70 - 20 = _______

start at 70, back back 20 (up 2), answer is 50

300

Use a hundreds chart to SUBTRACT:

100 - 80 = _______

start at 100, go back 80 (up 8), answer is 20

400

Use a hundreds chart to SUBTRACT:

70 - 60 = _______

start at 70, go back 60 (up 6), answer is 10