Câu 1: Trang 136 - Toán tiếng anh lớp 5:Calculate:Tính:a) 3 hours 12 minutes x 33 giờ 12 phút...

Cách làm:

a)
- 3 hours 12 minutes x 3
= (3 x 60) minutes + 12 minutes x 3
= 180 minutes + 36 minutes
= 216 minutes
= (216 ÷ 60) hours + (216 mod 60) minutes
= 3 hours 36 minutes
Vậy, 3 hours 12 minutes x 3 = 3 hours 36 minutes

- 4 hours 23 minutes x 4
= (4 x 60) minutes + 23 minutes x 4
= 240 minutes + 92 minutes
= 332 minutes
= (332 ÷ 60) hours + (332 mod 60) minutes
= 5 hours 32 minutes
Vậy, 4 hours 23 minutes x 4 = 5 hours 32 minutes

- 12 minutes 25 seconds x 5
= (12 x 60) seconds + 25 seconds x 5
= 720 seconds + 125 seconds
= 845 seconds
= (845 ÷ 60) minutes + (845 mod 60) seconds
= 14 minutes 5 seconds
Vậy, 12 minutes 25 seconds x 5 = 14 minutes 5 seconds

b)
- 4.1 hours x 6
= 4.1 x 6
= 24.6 hours

- 3.4 minutes x 4
= 3.4 x 4
= 13.6 minutes

- 9.5 seconds x 3
= 9.5 x 3
= 28.5 seconds

Câu trả lời:
a)
- 3 hours 12 minutes x 3 = 3 hours 36 minutes
- 4 hours 23 minutes x 4 = 5 hours 32 minutes
- 12 minutes 25 seconds x 5 = 14 minutes 5 seconds

b)
- 4.1 hours x 6 = 24.6 hours
- 3.4 minutes x 4 = 13.6 minutes
- 9.5 seconds x 3 = 28.5 seconds