Giải Vở bài tập Toán 3 bài 42: Đề-ca-mét. Héc-tô-mét

Thứ ba - 20/08/2019 22:28
Giải Vở bài tập Toán 3 bài 42: Đề-ca-mét. Héc-tô-mét
1. Số?
1hm = 100m
1hm = l0dam
1dam = 10m
1km = 1000m

1m = 100cm
1m = 10dm
1dm = 10cm
1cm = 10mm.

2. Viết số thích hợp vào chỗ chấm (theo mẫu):
Mẫu:
2dam = 20m
6dam = 60m
8dam = 80m
4dam = 40m

5hm = 500m
3hm = 300m
7hm = 700m
9hm = 900m

3. Tính (theo mẫu):
Mẫu: 9dam + 4dam = 13dam
6dam + 15dam = 21 dam
52dam + 37dam = 89dam
48dam + 23dam = 71 dam
18hm - 6hm = 12hm
16hm - 9hm = 7hm
76dam - 25dam = 51dam
63hm - 18hm = 45hm.

4. Một cuộn dây thừng dài 2dam. Một cuộn dây ni lông dài gấp 4 lần cuộn dây thừng. Hỏi cuộn dây ni lông dài bao nhiêu mét ?
Tóm tắt:
giai VBt toan lop 3 bai 42 cau 4
Bài giải:
Cuộn dây ni lông dài là:
2 x 4 = 8 (dam)
8dam = 80m
Đáp số: 80m
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