Giải Vở bài tập Toán 3 bài 145: Luyện tập

Thứ năm - 29/08/2019 12:10
Giải Vở bài tập Toán 3 bài 145: Luyện tập
1. Tính nhẩm:
80000 - 50000 = 30000
90000 - 70000 = 20000
60000 - 20000 = 40000

70000 - 60000 = 1000
100000 - 90000 = 10000
100000 - 30000 = 70000

2. Đặt tính rồi tính:
                   

                   

3. Một công ty thu được 32 650kg cà phê. Công ty đã bán lần đầu được 20 000kg, lần sau bán 12 600kg. Hỏi công ty đó còn lại bao nhiêu ki-lô-gam cà phê ?
Tóm tắt:
giai VBt toan lop 3 bai 145 cau 3

Cách 1:
Số ki-lô-gam cà phê công ty đã bán sau hai lần là:
20000 + 12600 = 32600 (kg)
Số ki-lô-gam cà phê công ty còn lại là:
32650 - 32600 = 50 (kg)
Đáp số: 50kg
Cách 2:
Số ki-lô-gam cà phê sau khi bán lần đầu công ty còn lại là:
32650 - 20000 = 12650 (kg)
Số ki-lô-gam cà phê công ty còn lại là:
12650 - 12600 = 50 (kg)
Đáp số: 50kg
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