Multiple Two-digit Addition

Expanded Form

100

22+10+32

64

200

25+18+42

85

300

14+23+31+46

114

400

73+35+17+45

170

Algorithm

100

21+18+33

72

200

39+62+17

118

300

67+78+22+13

180

400

32+45+17+68

162

Two at a time

100

35+19+21

75

200

46+77+56 

179

300

30+32+16+43

121

400

32+45+17+68

162

Making 10s

100

35+17+43

95

200

71+72+13

156

300

66+44+33+11

154

400

20+32+18+40

110

Random

100

46+31+19

96

200

18+73+56

147

300

67+23+26+18

134 

400

17+36+48+90

191