1.
39.72 + 46.18 = 85.9 39.7 + 46.18 = 85.88 95.64 - 27.35 = 68.29 95.6 - 27.35 = 68.25
31.05 × 2.6 = 80.73 77.5 ÷ 2.5 = 31 51.5 ÷ 2.5 = 20.6
2.
8m5dm=8.5m 23m²4dm²=23.04 m² 7hm²5m²=700.05dam² 900cm²=0.09m²
8m9cm=8.09m 23km²8dam²=23.0008km² 4.5dam²=450m² 600m²=0.06ha
3a.
Chọn D
b.
Chọn B
c.
Chọn C
d.
Chọn A
4.
Chọn C
5.
25.84 × 0.1 = 2.584