Level 3
I am an even number. When 1 is added to me and I am rounded off to the nearest ten, I become 660. When 1 is subtracted from me and I am rounded off to the nearest ten, I become 650. What number am I?
Level 3
An even 5-digit whole number is made up of different digits. The digit in the ten thousands place is the smallest even number. It is 5 less than the tens digit. The thousands digit is twice of the hundreds digit. The hundreds digit is 4 less than the tens digit. What is the smallest possible 5-digit whole number?
Level 3
I am a 2-digit even number. I am greater than 30 but smaller than 40. When you multiply by ones digit with the tens digit, the answer is 24. What number am I?