Thi chon HSG vao lop 3

Thi chọn HSG - Lớp 3
Môn :Toán
Thời gian:60 phút

Họ và tên :...........................................................................

Bài 1:Tính:
a, 5 6 + 125 b, 28 : 4 – 5 c, 354 – 261 + 678
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Bài 2: Tìm x:
a, x 5 + 245 = 260 b, x + 3 + 4 + 5 = 56
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c, x+x+x+x = 32 d, x: 4 = 234 - 226
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Bài 3: Tính bằng cách thuận tiện nhất:
a, 859 – 125 + 41 – 75 b, 4 + 4 +4 + ...+ 4 – 20 (10 số 4)
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c, 1 + 1 + 1 + ...+ 1 (100 số 1) d, 125 + 42 + 87+ 68+13 + 75
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Bài 4:Hình vẽ sau có mấy hình tam giác, có mấy hình tứ giác? Kể tên các hình đó?


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Bài 5: Lan, Bình, Hoa có tất cả 50 viên bi, biết rằng số bi của Lan và Bình cộng lại bằng 31 viên. Số bi của Hoa và Lan cộng lại bằng 34 viên.Tính số bi của mỗi bạn?
Bài giải

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