18 bài tập Cộng, trừ số thập phân có lời giải
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Đặt tính rồi tính: a) 34,87 + 2,96     

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Đặt tính rồi tính:

a) 34,87 + 2,96                           b) 56,92 + 5,8                   c) 71,09 + 25,91

d) 0,27 + 9,73                             e) 45,7 – 13,8                   f) 100,99 – 99,100

g) 42,7 – 13,8                             h) 71,6 – 9,8                     i) 90,1 – 34,87

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Giải thích

Hướng Dẫn Giải

a) \[\begin{array}{l} + \begin{array}{*{20}{c}}{34,87}\\{\underline {\,\,\,2,96} }\end{array}\\\,\,\,\,37,83\end{array}\]

b) \[\begin{array}{l} + \begin{array}{*{20}{c}}{56,92}\\{\underline {\,\,\,5,8\,\,\,} }\end{array}\\\,\,\,\,62,72\end{array}\]

c) \[\begin{array}{l} + \begin{array}{*{20}{c}}{71,09}\\{\underline {25,91} }\end{array}\\\,\,\,\,97,00\end{array}\]

d) \[\begin{array}{l} + \begin{array}{*{20}{c}}{\,\,0,27}\\{\underline {\,\,\,9,73} }\end{array}\\\,\,\,\,\,10,00\end{array}\]

e) \[\begin{array}{l} - \begin{array}{*{20}{c}}{45,7}\\{\underline {\,13,8\,} }\end{array}\\\,\,\,\,\,31,9\end{array}\]

f) \[\begin{array}{l} - \begin{array}{*{20}{c}}{100,990}\\{\underline {\,\,99,100} }\end{array}\\\,\,\,\,\,\,\,\,\,\,\,1,89\end{array}\]

g) \[\begin{array}{l} - \begin{array}{*{20}{c}}{42,7}\\{\underline {13,8} }\end{array}\\\,\,\,\,28,9\end{array}\]

h) \[\begin{array}{l} - \begin{array}{*{20}{c}}{71,6}\\{\underline {\,\,\,9,8} }\end{array}\\\,\,\,\,61,8\end{array}\]

i) \[\begin{array}{l} - \begin{array}{*{20}{c}}{90,1}\\{\underline {\,\,\,34,87} }\end{array}\\\,\,\,\,\,\,\,55,23\end{array}\]