1. 直接写出得数。(8分)
$763×0=$
$59×40≈$
$763×0=$
0
$30×800=$24000
$29×102≈$3000
$177+304=$481
$59×40≈$
2400
$24×50=$1200
$89×49≈$4500
$125×8=$1000
答案:
0
24000
3000
481
2400
1200
4500
1000
24000
3000
481
2400
1200
4500
1000
2. 用竖式计算。(24分)
$17×204=$
$102×25=$
$17×204=$
3468
$56×820=$45920
$64×89=$5696
$102×25=$
2550
$423×70=$29610
$232×46=$10672
答案:
3468,45920,5696,2550,29610,10672 竖式略
3. 不计算,根据规律写得数。(6分)
(1)$3×9= 27$
$33×69= 2277$
$333×669= 222777$
$3333×6669=$(
$33333×66669=$(
$333333×$(
(2)$2×5= 10$
$22×55= 1210$
$222×555= 123210$
$2222×5555= 12343210$
$22222×55555=$(
$222222×555555=$(
(1)$3×9= 27$
$33×69= 2277$
$333×669= 222777$
$3333×6669=$(
22227777
)$33333×66669=$(
2222277777
)$333333×$(
666669
)=(222222777777
)(2)$2×5= 10$
$22×55= 1210$
$222×555= 123210$
$2222×5555= 12343210$
$22222×55555=$(
1234543210
)$222222×555555=$(
123456543210
)
答案:
(1)22227777,2222277777,666669,222222777777
(2)1234543210,123456543210
(1)22227777,2222277777,666669,222222777777
(2)1234543210,123456543210
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