Đề thi chọn hoc sinh giỏi lớp 5
Chia sẻ bởi Phạm Thị Thoa |
Ngày 10/10/2018 |
38
Chia sẻ tài liệu: Đề thi chọn hoc sinh giỏi lớp 5 thuộc Toán học 5
Nội dung tài liệu:
Phòng GD&ĐT thành phố Đề khảo sát học sinh giỏi lớp 5 vòng2
Trường tiểu học Tam Thanh Năm học: 2008 – 2009
Môn: Toán
Thời gian làm bài 90 phút (Không kể thời gian giao đề)
Bài 1: (5điểm) Tính giá trị biểu thức bằng cách nhanh nhất:
117 x ( 360 + 620 ) – 17 x ( 620 + 360 )
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( 45 x 46 + 47 x 48 ) x ( 45 x 130 – 90 x 65 )
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Bài 2:(6 điểm )
a)Tìm một số tự nhiên có 2 chữ số, biết rằng nếu viết thêm một chữ số 1
vào bên trái của số đó thì ta được số mới gấp 5 lần số đã cho.
b)Lớp 5A và lớp 5B trồng được một số cây. Biết trung bình cộng số cây hai
lớp đã trồng bằng 235 cây và nếu lớp 5A trồng thêm 80 cây, lớp 5B trồng thêm 40 cây thì số cây hai lớp đẫ trồng sẽ bằng nhau. Tìm số cây mỗi lớp đã trồng?
Bài giải
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Bài 3:( ( 3điểm )
Một người bán vải, buổi sáng bán được tấm vải. Buổi chiều bán được chỗ vải còn lại thì tấm vải chỉ còn 12 m. Hỏi:
Tấm vải dài bao nhiêu mét?
Mỗi buổi bán được bao nhiêu mét?
Bài giải
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Bài 4: ( 4 điểm )
Trên một thửa đất hình vuông người ta đào một cái ao hình vuông. Cạnh ao cách đều cạnh thửa đất là 2 m. Tổng diện tích đất còn lại làm lối đi là 64m2. Tính diện tích ao?
Bài giải
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Phòng GD&ĐT thành phố Đáp án khảo sát học sinh giỏi lớp 5 vòng2
Trường tiểu học Tam Thanh Năm học: 2008 – 2009
Môn: Toán
Thời gian làm bài 90 phút (Không kể thời gian giao đề)
Bài 1: (5điểm) Tính giá trị biểu thức bằng cách nhanh nhất:
a)117 360 + 620) – 17 (620 + 360)
= 117 980 - 17 980
= (117 – 17) 980
= 100 980
= 98 000
( 45 46 + 47 48 ) ( 45 130 – 90 65 )
= A ( 45 2 65 - 90 65)
= A (90 65 - 90 65)
= A 0
= 0
Bài 2:(6 điểm )
a)Tìm một số tự nhiên có 2 chữ số, biết rằng nếu viết thêm một chữ số 1
vào bên trái của số đó thì ta được số mới gấp 5 lần số đã cho.
b)Lớp 5A và lớp 5B trồng được một số cây. Biết trung bình
Trường tiểu học Tam Thanh Năm học: 2008 – 2009
Môn: Toán
Thời gian làm bài 90 phút (Không kể thời gian giao đề)
Bài 1: (5điểm) Tính giá trị biểu thức bằng cách nhanh nhất:
117 x ( 360 + 620 ) – 17 x ( 620 + 360 )
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............................................................................................................................................................................................................................................................................................................................................
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...........................................................................................................................................................................................................................................................................................................................................
...........................................................................................................................................................................................................................................................................................................................................
( 45 x 46 + 47 x 48 ) x ( 45 x 130 – 90 x 65 )
..........................................................................................................................................................................................................................................................................................................................................
...........................................................................................................................................................................................................................................................................................................................................
............................................................................................................................................................................................................................................................................................................................................
............................................................................................................................................................................................................................................................................................................................................
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Bài 2:(6 điểm )
a)Tìm một số tự nhiên có 2 chữ số, biết rằng nếu viết thêm một chữ số 1
vào bên trái của số đó thì ta được số mới gấp 5 lần số đã cho.
b)Lớp 5A và lớp 5B trồng được một số cây. Biết trung bình cộng số cây hai
lớp đã trồng bằng 235 cây và nếu lớp 5A trồng thêm 80 cây, lớp 5B trồng thêm 40 cây thì số cây hai lớp đẫ trồng sẽ bằng nhau. Tìm số cây mỗi lớp đã trồng?
Bài giải
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Bài 3:( ( 3điểm )
Một người bán vải, buổi sáng bán được tấm vải. Buổi chiều bán được chỗ vải còn lại thì tấm vải chỉ còn 12 m. Hỏi:
Tấm vải dài bao nhiêu mét?
Mỗi buổi bán được bao nhiêu mét?
Bài giải
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Bài 4: ( 4 điểm )
Trên một thửa đất hình vuông người ta đào một cái ao hình vuông. Cạnh ao cách đều cạnh thửa đất là 2 m. Tổng diện tích đất còn lại làm lối đi là 64m2. Tính diện tích ao?
Bài giải
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...........................................................................................................................................................................................................................................................................................................................................
Phòng GD&ĐT thành phố Đáp án khảo sát học sinh giỏi lớp 5 vòng2
Trường tiểu học Tam Thanh Năm học: 2008 – 2009
Môn: Toán
Thời gian làm bài 90 phút (Không kể thời gian giao đề)
Bài 1: (5điểm) Tính giá trị biểu thức bằng cách nhanh nhất:
a)117 360 + 620) – 17 (620 + 360)
= 117 980 - 17 980
= (117 – 17) 980
= 100 980
= 98 000
( 45 46 + 47 48 ) ( 45 130 – 90 65 )
= A ( 45 2 65 - 90 65)
= A (90 65 - 90 65)
= A 0
= 0
Bài 2:(6 điểm )
a)Tìm một số tự nhiên có 2 chữ số, biết rằng nếu viết thêm một chữ số 1
vào bên trái của số đó thì ta được số mới gấp 5 lần số đã cho.
b)Lớp 5A và lớp 5B trồng được một số cây. Biết trung bình
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