Câu số 9: The perimeter of a rectangle is 64cm and its length is 16cm more than its width.The area of this rectangle is ………..cm2
Câu số 11: Minh is 9 years old. If the average of age of Minh and his mother is 22, then his mother is ……….years old.
Câu số 12: The sum of two numbers is 47 and their difference is 15. The smaller number is ………..
Câu số 13: The average of 5, 7, 9, 11, 13 is ………
Câu số 17: 1/5 of 2m = ……….mm
Câu số 18: Calculate: 1524 × 7 = ………….
Câu số 19: If A is divisible by 4, then the remainder of A : 2 is ……..
Câu số 20: If m = 10; n = 5; p = 2 then m + n + p + 3 =……..
Câu số 21: If the perimeter of a square is 104m then its one side’s length is ……m
Câu số 22: Write the missing number: 4563005 - ………..= 2146356
Câu số 23: The average of three consecutive natural numbers is 37. The smallest number is………….
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