Hướng dẫn giải bài tập SGK Toán lớp 3 trang 157: Phép trừ các số trong phạm vi 100 000

Thứ năm - 16/11/2017 07:37
Hướng dẫn giải bài tập SGK Toán lớp 3 trang 157: Phép trừ các số trong phạm vi 100 000

Bài 1: (Hướng dẫn giải bài tập số 1 SGK)
Tính


Bài 2: (Hướng dẫn giải bài tập số 2 SGK)
Đặt tính rồi tính
a) 63780 – 18546     b) 91462 – 53406     c) 49283 – 5765

Hướng dẫn giải


Bài 3: (Hướng dẫn giải bài tập số 3 SGK)
Một quãng đường dài 25850m, trong đó có 9850m đường đã trải nhựa. Hỏi còn bao nhiêu kilomet đường chưa trải nhựa

Hướng dẫn giải
Độ dài đoạn đường chưa trải nhựa:
25850 – 9850 = 16000 (m)
16000m = 16km

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