Câu 9: If 2 x a = 10 and 3 x b = 12 then 4 x a + 6 x b =...
Câu 10: 35 x 456 = 400 x 35 + 35 x .... What is the missing number?
Câu 11: It cost $ 15 to buy 3 books. If Nam want to buy 5 books, he must pay $...
Câu 12: Of the 48 students, 21 are girls. How many more boys are there than girls?
Câu 13: The number of pens is twice the number of pencils in a stationery. The number of pencils is 6 times the number of erasers in the shop. How many times is the number os pens as many as the number of erasers?
Câu 14: Jaya is 19 years old. Six years ago her mother was three times as old as her. How old is her mother now?
Câu 15: The product of 3 numbers is 72. If two of the numbers are 2 and 3. What is the third number?
Câu 16: Mr Nam is twice as old as his daughter. If he is 50 years old now, how old will his daughter be in ten years time?
Câu 17: How many even number ar there between 4006 and 4022?
Câu 18: The perimeter of a square is 64cm. How long is each side?
Câu 19: Which of the following is not divisible by 7?
a) 42; b) 63; c) 74; d) 35
Câu 20: Which number's underlined digit is worth 60?
a) 7619; b) 4826; c) 6842; d) 8563
Câu 21: After rounding off the result of a sum to the nearest hundred, the answer is 2500. Which of the following is most likely to be this answer?