Bài 1. Khoanh vào chữ đặt trước câu trả lời đúng. 1. Chữ số 5 trong số 2,953 thuộc hàng nào ? A. Hàng chục B. Hàng phần mười C. Hàng phần trăm D. Hàng phần nghìn 2. Chữ số 8 trong số thập phân 32,879 có giá trị là : A. B. C. D. 800 Bài 2. Viết số thích hợp vào chỗ chấm : a) Tỉ số phần trăm của hai số 7,5 và 25 là ……………………. b) 40,5% của 200 là ……………………. c) Biết 8% của số x là 2,4. Vậy số x là ……………………. Bài 3. Đúng ghi Đ, sai ghi S vào ô trống : a) 12,89 > 12,9 b) 34,725 < 34,73 c) 3,9 = 3,09 d) 27,99 > 28,11 Bài 4. Tính giá trị của biểu thức : a) 43,2 : 12 × 0,5 + 4,789 b) 50 – 3,4 × (87 : 25) Bài 5. Viết số thích hợp vào chỗ chấm : a) 4km 360m = …………………… km b) 3ha 400m 2 = …………………… ha Bài 7. Tìm các số tự nhiên x, biết : a) x < 3,001 b) 10,99 < x < 14,99 Các số tự nhiên x cần tìm là …………………… Các số tự nhiên x cần tìm là ………………………… Bài 8. Lan mua 3 bịch bánh hết số tiền là 19500 đồng. Hỏi Bình mua 12 bịch bánh loại đó hết bao nhiêu tiền ? Bài giải Bài 9. Tổng của hai số là 48,72. Hiệu của hai số đó là 13,32. Tìm hai số đó. Bài giải Bài 10. Tìm x, biết : 460 : x : 0,4 = 92

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