Grade 3

Digit riddles

The answer is a number you have to build, not compute -- count the tens, count the digits, then figure out where the 2 belongs.

1
The roundest number
Think of the largest two-digit multiple of $10$ . What is the difference between that number and $28$ ?
2
Digits that add to seven
What is the largest two-digit number whose digits add up to $7$ ?
3
The digit out front
Two numbers add up to $328$ . The smaller number has two digits, and placing the digit $2$ in front of it gives the larger number. What are the two numbers?