1. 直接写出得数。
4300 - 4000 = 3000 + 400 = 9000 - 3000 = 5400 - 400 =
8000 + 1000 = 5600 - 5000 = 300 + 400 = 600 + 60 =
70 + 600 = 700 - 200 = 2000 + 800 = 9000 - 2000 =
480 - 80 = 2000 + 300 = 1100 - 100 = 400 + 6000 =
900 + 30 = 270 - 200 = 500 + 3000 = 180 - 100 =
300 + 500 = 900 - 600 = 8300 - 300 = 90 + 400 =
2100 - 2000 = 700 + 300 = 9400 - 400 = 30 + 600 =
500 + 20 = 6000 - 2000 = 8000 - 4000 = 5000 + 4000 =
4300 - 4000 = 3000 + 400 = 9000 - 3000 = 5400 - 400 =
8000 + 1000 = 5600 - 5000 = 300 + 400 = 600 + 60 =
70 + 600 = 700 - 200 = 2000 + 800 = 9000 - 2000 =
480 - 80 = 2000 + 300 = 1100 - 100 = 400 + 6000 =
900 + 30 = 270 - 200 = 500 + 3000 = 180 - 100 =
300 + 500 = 900 - 600 = 8300 - 300 = 90 + 400 =
2100 - 2000 = 700 + 300 = 9400 - 400 = 30 + 600 =
500 + 20 = 6000 - 2000 = 8000 - 4000 = 5000 + 4000 =
答案
1. 300 3400 6000 5000 9000 600 700 660 670 500 2800 7000 400 2300 1000 6400 930 70 3500 80 800 300 8000 490 100 1000 9000 630 520 4000 4000 9000
2. 在〇里填“>”或“<”。
456〇465 5398〇5287 6002〇6020
1323〇948 7356〇8450 989〇1000
3687〇3678 5462〇5465 5000〇4597
456〇465 5398〇5287 6002〇6020
1323〇948 7356〇8450 989〇1000
3687〇3678 5462〇5465 5000〇4597
答案
2. < > < > < < > < >
3. □里最大能填几?
809>80□ 2641>2□82 300☆>□999
6□2<712 2735>2□35 228□<2285
8501>□637 5□06<5301 7869>78□3
809>80□ 2641>2□82 300☆>□999
6□2<712 2735>2□35 228□<2285
8501>□637 5□06<5301 7869>78□3
答案
3. 8 5 2 9 6 4 7 2 6
在算盘上拨7个珠靠梁表示一个四位数,能拨出的最大数是(
9600
),最小数是(1019
)。答案
思维提升
9600 1019
9600 1019
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