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Hướng dẫn giải bài tập SGK Toán lớp 4 trang 80: Chia hai số có tận cùng là các chữ số 0

Thứ ba - 28/11/2017 07:41
Hướng dẫn giải bài tập SGK Toán lớp 4 trang 80: Chia hai số có tận cùng là các chữ số 0
BÀI 1. Tính (Hướng dẫn giải bài tập số 1 trang 80/SGK Toán 4)
a) 420 : 60                 b) 85000 : 500
4500 : 500                 92000 : 400
Hướng dẫn giải:
a) 420 : 60 = 42 : 6 = 7
4500 : 500 = 45 : 5 = 9
b) 85000 : 500 = 850 : 5 = 170
92000 : 400 = 920 : 4 = 230

BÀI 2. (Hướng dẫn giải bài tập số 2 trang 80/SGK Toán 4)
Tìm x:
a) x × 40 = 25600;                  b) x × 90 = 37800.
Hướng dẫn giải:
a) x × 40 = 25600
    x = 25600 : 40
    x = 640
b) x × 90 = 37800
    x = 37800 : 90
    x = 420

Bài 3: (Hướng dẫn giải bài tập số 3 trang 80 SGK Toán 4)
Người ta dự định xếp 180 tấn hàng lên các toa xe lửa. Hỏi:
a) Nếu mỗi toa xe chở được 20 tấn hàng thì cần mấy toa xe loại đó?
b) Nếu mỗi ta xe chở được 30 tấn hàng thì cần mấy toa xe loại đó?
Hướng dẫn giải:
Nếu mỗi toa xe chở 20 tấn hàng thì cần số toa xe là:
    180 : 20 = 9 (toa)
Nếu mỗi toa xe chở 30 tấn hàng thì cần số toa xe là:
    180 : 30 = 6 (toa)
Đáp số: a. 9 toa xe
b. 6 toa xe

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