《2025年灵机一动小学数学口算心算三年级上册苏教版》

口算练习 21
1
270×7=1890
65-28=37
7700-700=7000
28+26=54
1000+8000=9000
403×2=806
304×5=1520
4×208=832
435×6=2610
16÷8=2
900+4000=4900
380×2=760
2×404=808
200+5000=5200
160×7=1120
2
3×520=1560
3×280=840
9×91=819
9×120=1080
632×2=1264
320×2=640
5×200=1000
2×232=464
2×219=438
130×3=390
300×6=1800
2×222=444
4×405=1620
21×3=63
210×3=630
3
801×5=4005
320×7=2240
950×3=2850
(350-250)×6=600
4×315=1260
420×5=2100
3×630=1890
840×6=5040
81÷9=9
60+500=560
570-70=500
8×606=4848
8×45=360
604×8=4832
430×7=3010

答案： 解析：本题主要考查了三位数乘一位数、两位数乘一位数、整十整百数的加减法以及简单的除法运算。这些题目都是基础运算，需要熟练掌握运算规则，快速准确地得出答案。
答案：
1.
$270 × 7 = 1890$
$65 - 28 = 37$
$7700 - 700 = 7000$
$28 + 26 = 54$
$1000 + 8000 = 9000$
$403 × 2 = 806$
$304 × 5 = 1520$
$4 × 208 = 832$
$435 × 6 = 2610$
$16 ÷ 8 = 2$
$900 + 4000 = 4900$
$380 × 2 = 760$
$2 × 404 = 808$
$200 + 5000 = 5200$
$160 × 7 = 1120$
2.
$3 × 520 = 1560$
$3 × 280 = 840$
$9 × 91 = 819$
$9 × 120 = 1080$
$632 × 2 = 1264$
$320 × 2 = 640$
$5 × 200 = 1000$
$2 × 232 = 464$
$2 × 219 = 438$
$130 × 3 = 390$
$300 × 6 = 1800$
$2 × 222 = 444$
$4 × 405 = 1620$
$21 × 3 = 63$
$210 × 3 = 630$
3.
$801 × 5 = 4005$
$320 × 7 = 2240$
$950 × 3 = 2850$
$(350 - 250) × 6 = 600$
$4 × 315 = 1260$
$420 × 5 = 2100$
$3 × 630 = 1890$
$840 × 6 = 5040$
$81 ÷ 9 = 9$
$60 + 500 = 560$
$570 - 70 = 500$
$8 × 606 = 4848$
$8 × 45 = 360$
$604 × 8 = 4832$
$430 × 7 = 3010$