《2025年新课堂同步学习与探究五年级数学上学期青岛版》

3. 比一比。(在“$◯$”里填上“$＞$”“$＜$”或“$=$”。)
$13.76×0.8◯$＜$13.76$ $0.2◯$＜$1.1×0.2$ $0.3×3◯$＞$0.3×0.3$
$5.2×0.6◯$=$0.52×6$ $8.4×1.3◯$＞$0.9×8.4$ $6.4×0.2◯$＜$6.4×0.5$
$4.48×0.46◯$＞$4.48×0.406$ $5.25×0.75◯$＜$5.25 + 0.75$

答案： ＜ ＜ ＞ = ＞ ＜ ＞ ＜

4. 直接写得数。
$0.45×2.5 = $1.125 $0.8×1.25 = $1 $0.3×3.6 = $1.08 $0.3×0.3 = $0.09
$10×0.07 = $0.7 $0.3×1.4 = $0.42 $0.05×7 = $0.35 $0.92×0.4 = $0.368
$0.2×0.26 = $0.052 $1.25 - 0.25 = $1 $0.02×0.1 = $0.002 $1.2×0.3 = $0.36
$0.1×0.1 = $0.01 $0.24×0.5 = $0.12 $5.4 + 3.6 = $9 $0.14×4 = $0.56

答案： 1.125
1
1.08
0.09
0.7
0.42
0.35
0.368
0.052
1
0.002
0.36
0.01
0.12
9
0.56

5. 用竖式计算。
$0.04×0.12 = $0.0048 $5.76×3 = $17.28 $3.84×2.6≈$10.0
(保留一位小数。)
$14×0.16 = $2.24 $4.8×0.25 = $1.2 $0.125×1.4≈$0.18
(保留两位小数。)

答案： 0.0048 17.28 10.0 2.24 1.2 0.18

6. 计算。(能简算的要简算。)
$2.5×7.1×4$ $16.12×99 + 16.12$
$26×15.7 + 15.7×24$ $(2.275 + 0.625)×0.28$

答案： 71 1612 785 0.812