Tính (theo mẫu):
a) 3cm + 4 cm = 7cm
8cm + 1cm = …..
6cm + 4cm = …..
4cm + 5cm = …..
b) 8cm – 3cm = 5cm
6cm – 4 cm = …..
12cm – 2cm = …..
19cm – 7cm = …..
a)
8cm + 1cm = 9cm
6cm + 4cm = 10cm
4cm + 5cm = 9cm.
b)
6cm – 4 cm = 2cm
12cm – 2cm = 10cm
19cm – 7cm = 12cm.
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