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Hướng dẫn giải bài tập SGK Toán lớp 4 trang 61: Tính chất kết hợp của phép nhân

Thứ sáu - 24/11/2017 08:23
Hướng dẫn giải bài tập SGK Toán lớp 4 trang 61: Tính chất kết hợp của phép nhân
BÀI 1. Tính bằng hai cách theo mẫu: (Hướng dẫn giải bài tập số 1 trang 61/SGK Toán 4)
Mẫu: 2 × 5 × 4 = ?
Cách 1 : 2 × 5 × 4 = (2 × 5) × 4 = 10 × 4 = 40
Cách 2 : 2 × 5 × 4 = 2 × (5 × 4) = 2= 20 = 40
a) 4 × 4 × 3                          b) 5 × 2 × 7
 3 × 5 × 6                             3 × 4 × 5
Hướng dẫn giải​:
a) 4 × 5 × 3 = ?
Cách 1: 4 × 5 × 3 = ( 4 × 5) × 3 = 20 × 3 = 60
Cách 2: 4 × 5 × 3 = 4 × ( 5 × 3) = 4 × 15 = 60
3 × 5 × 6 = ?
Cách 1 : 3 × 5 × 6 = 3 × ( 5 × 6) = 3 × 30 = 90
Cách 2 : 3 × 5 × 6 = ( 3 × 5 ) × 6 = 15 × 6 = 90
b) 5 × 2 × 7 = ?
Cách 1 : 5 × 2 × 7 = ( 5 × 2 ) × 7 = 10 × 7= 70
Cách 2 : 5 × 2 × 7 = 5 × ( 2 × 7 ) = 5 × 14 = 70
3 × 4 × 5 = ?
Cách 1 : 3 × 4 × 5 = ( 3 × 4 ) × 5 = 12 × 5 = 60
Cách 2 : 3 × 4 × 5 = 3 × ( 4 × 5 ) = 3 × 20 = 60

BÀI 2. Tính bằng cách thuận tiện nhất (Hướng dẫn giải bài tập số 2 trang 61/SGK Toán 4)
a) 13 × 5 × 2                         b) 2 × 26 × 5
  5 × 2 × 34                           5 × 9 × 3 × 2
Hướng dẫn giải​:
a) 13 × 5 × 2 = 13 × (5 × 2) = 13 × 10 = 130
5 × 2 × 34 = (5 × 2 ) × 34 = 10 × 34 = 340
b) 2 × 26 × 5 = 26 × 2 × 5 = 26 × (2 × 5 ) = 26 × 10 = 260
5 × 9 × 3 × 2 = 9 × 3 × 5 × 2 = (9 × 3 ) × (5 × 2 ) = 27 × 10 = 270

Bài 3: Có 8 phòng học, mỗi phòng có 15 bộ bàn ghế, mỗi bộ bàn ghế có hai học sinh đang ngồi học. Hỏi có tất cả bao nhiên học sinh đang ngồi học?
Hướng dẫn giải​:
Số học sinh của mỗi lớp là:
2 × 15 = 30 (học sinh)
Số học sinh của trường học đó là :
30 × 8 = 240 (học sinh)
Đáp số : 240 học sinh

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