四、解决问题
★单元练习3
建议用时:6分钟
实际用时:分钟
5×3 =
432+529 =
254+133 =
379+285 =
257+306 =
330−125 =
113+387 =
8×6+52 =
4×9−21 =
7×3+19 =
3×2 =
57+36 =
27+45 =
81−47 =
50+140 =
8×5 =
7×4 =
54÷9 =
67−13 =
32÷4 =
19+16 =
308−230 =
859−467 =
823−634 =
483+102 =
524−205 =
8×5+5 =
5×9−20 =
3×8+44 =
9×6−31 =
8000−4000 =
1300−300 =
400+800 =
380−90 =
1000−600 =
760−700 =
350+470 =
1900−1000 =
600+70 =
8500−6000 =
76−37 =
20+60 =
90−80 =
91−7 =
20+62 =

$5×3=15$
$432+529=961$
$254+133=387$
$379+285=664$
$257+306=563$
$330-125=205$
$113+387=500$
$8×6+52=100$
$4×9-21=15$
$7×3+19=40$
$3×2=6$
$57+36=93$
$27+45=72$
$81-47=34$
$50+140=190$
$8×5=40$
$7×4=28$
$54÷9=6$
$67-13=54$
$32÷4=8$
$19+16=35$
$308-230=78$
$859-467=392$
$823-634=189$
$483+102=585$
$524-205=319$
$8×5+5=45$
$5×9-20=25$
$3×8+44=68$
$9×6-31=23$
$8000-4000=4000$
$1300-300=1000$
$400+800=1200$
$380-90=290$
$1000-600=400$
$760-700=60$
$350+470=820$
$1900-1000=900$
$600+70=670$
$8500-6000=2500$
$76-37=39$
$20+60=80$
$90-80=10$
$91-7=84$
$20+62=82$

拓展园地
右面的加法竖式中,相同的图形代表相同的数字。要使竖式成立,“☆”代表什么数字？

7