10 kg : 2 = 5 kg                        18 cm : 2 = 9 cm                       16 l : 2 = 8 l

14 kg : 2 = 7 kg                        20 dm : 2 = 10 dm                    12 l : 2 = 12 l

Hình màu cam, màu vàng, màu đỏ

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       \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{52}\\{48}\end{array}}\\\hline{\,\,100}\end{array}\)                                 \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{34}\\{66}\end{array}}\\\hline{\,100}\end{array}\)

b,

2 x 2 = 4

2 x 7 = 14

2 x 3 = 6

2 x 8 = 16

2 x 4 = 8

2 x 9 = 18

\(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{37}\\{\,\,4}\end{array}}\\\hline{\,\,\,41}\end{array}\)                                      \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{29}\\{\,\,9}\end{array}}\\\hline{\,\,\,38}\end{array}\)

\(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{46}\\{\,\,5}\end{array}}\\\hline{\,\,\,51}\end{array}\)                                      \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{66}\\{\,\,7}\end{array}}\\\hline{\,\,\,73}\end{array}\)

\(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{89}\\{\,\,6}\end{array}}\\\hline{\,\,\,95}\end{array}\)                                      \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{53}\\{\,\,8}\end{array}}\\\hline{\,\,\,61}\end{array}\)