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Writing Digits

Lee was writing all the counting numbers from 1 to 20. She stopped for a rest after writing seventeen digits. What was the last number she wrote?

Number Detective

Follow the clues to find the mystery number.

Six Is the Sum

What do the digits in the number fifteen add up to? How many other numbers have digits with the same total but no zeros?

Less Is More

Age 5 to 11
Challenge Level

How are you deciding where to place the numbers?
How are you trying to make sure each number sentence is true?