1. 直接写出得数。(每题 1★)
$1.7 - 0.6 = $ $0.3 + 0.7 = $ $2 - 0.5 = $ $4.9 + 0.8 = $
$2.1 + 0.3 = $ $3.2 + 5.4 = $ $1.8 - 0.4 = $ $3.7 - 0.6 = $
$1.5 - 0.5 = $ $2.1 - 0.2 = $ $2.3 + 0.7 = $ $5.1 + 5 = $
$1.1 + 4.4 = $ $2.5 + 1.4 = $ $7.6 - 6 = $ $4.5 - 2.1 = $
$7.4 + 1.2 = $ $1.9 + 3.6 = $ $5.9 - 3.6 = $ $0.8 + 0.6 = $
$1.3 - 0.8 = $ $6.5 - 2.3 = $ $1.9 + 5.2 = $ $7.3 - 3.2 = $

1.1 1 1.5 5.7 2.4 8.6 1.4 3.1 1 1.9 3 10.1 5.5 3.9 1.6 2.4 8.6 5.5 2.3 1.4 0.5 4.2 7.1 4.1

2. 列竖式计算。(每题 3★)
$47.9 + 26.3 = $ $51.8 - 19 = $ $36.2 + 47 = $



$63 - 26.5 = $ $18.9 + 5.4 = $ $84.1 - 44.2 = $

74.2 32.8 83.2 36.5 24.3 39.9 (竖式略)

3. 脱式计算。(每题 4★)
$16.8 - 5.9 + 43.7$ $26.8 + 68.4 - 17.5$ $67.8 - (51.2 - 26.9)$

54.6 77.7 43.5