Hướng dẫn giải bài tập SGK Toán lớp 5 trang 135: Nhân số đo thời gian với một số

Thứ ba - 09/01/2018 07:48
Hướng dẫn giải bài tập SGK Toán lớp 5 trang 135: Nhân số đo thời gian với một số

Câu 1: Tính

a) 3 giờ 12 phút x 3

4 giờ 23 phút x 4

12 phút 25 giây x 5

b) 4,1 giờ x 6

3,4 phút x 4

9,5 giây x 3

Câu 2: Một chiếc đu quay mỗi vòng hết 1 phút 25 giây. Bé Lan ngồi trên đu quay và quay 3 vòng. Hỏi bé Lan ngồi trên đu quay bao nhiêu lâu?

HƯỚNG DẪN GIẢI

Câu 1: Tính

a) 3 giờ 12 phút x 3 = 9 giờ 36 phút

4 giờ 23 phút x 4 = 17 giờ 32 phút

12 phút 25 giây x 5 = 1 giờ 2 phút 5 giây

b) 4,1 giờ x 6 = 24,6 giờ

3,4 phút x 4 = 13,6 phút

9,5 giây x 3 = 28,5 giây

Câu 2:

Thời gian bé Lan ngồi trên đu quay là:

1 phút 25 giây x 3 = 4 phút 15 giây

Đáp số: 4 phút 15 giây

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