Đề kiểm tra chọn học sinh giỏi Toán Lớp 4 - Bài số 2

 KIỂM TRA HỌC SINH GIỎI TOÁN 4
 BÀI SỐ 2
 Thời gian 90 phút ( không kể thời gian giao đề)
Họ và tên HS: ...............................................................Lớp 4............................................
Bài 1: Tính nhanh:
36 327 + 327 63 + 327
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b) 33 - 3 + 3 + 3 + ......+ 3 + 3
 10 số 3
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Bài 2: Trung bình cộng của hai số là số bé nhất có 3 chữ số. Biết số bé bằng số lớn. .Tìm hai số dó.
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..........................................................................................................................................................................................................................................................................................Bài 3: Tổng hai số là 788, biết xoá chữ số 7 ở hàng trăm của số lớn được số bé. Tìm hai số đó.
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Bài 4:
 Bình có 22 viên bi gồm bi đỏ và bi xanh. Bình cho em 3 viên bi đỏ và 2 viên bi xanh. Bạn An lại cho Bình thêm 7 viên bi đỏ nữa, lúc này Bình có số bi đỏ gấp đôi số bi xanh. Hỏi lúc đầu Bình có bao nhiêu viên bi mỗi loại?
 Giải
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Bài 5: Một hình chữ nhật có chu vi là 140 m. Nếu tăng chiều dài 5 m và giữ nguyên chiều rộng thì ta được một hình chữ nhật mới có chiều rộng bằng chiều dài. Tính diện tích hình chữ nhật ban đầu.
 Giải
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