Show:
Place Value
Break Apart
Add up to solve (number line)
Count Back to solve (number line)
Mystery
100

98 - 63 

= 35

100

88 - 35

= 53

100

87 - 46 

= 41

100

74 - 33

=41

100

Solve with place value- 

56 - 32

=24

200

77 - 34 

= 43

200

59 - 47

= 12

200

55 - 32

=23

200

75 - 45 

=30

200

Solve with number line- 

87 - 53

=34

300

45 - 21 

= 24

300

67 - 21 

=46 

300

69 - 14

=55

300

49 - 31 

=18

300

4 x 4 

=16
400

98 - 57

= 41

400

78 - 51

= 27

400

64 - 22 

=42

400

62 - 22

=40

400

861 + 123

=984

500

328 - 216

=112

500

665 - 342 

= 323

500

789 - 541

=248

500

826 - 414

=412

500

Write as many numbers as you can in 1 minute... 

The most written wins this one! 

Various answers