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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

Yaochen from Little Hill responded:

I notice that putting the biggest numbers on the dice in the boxes on the right will make it correct all of the time because that is where the numbers are bigger than the number in the blue boxes.

That's good advice, Yaochen. I think the tricky part is trying to predict which numbers will in fact be the biggest when you haven't yet rolled eight times. Remember, the idea in the competitive version of the game is to put each number in a box as you roll.

Do you have any 'noticings' to add to Yaochen's?

We would love to hear from you if you have worked on the competitive or collaborative versions of this game, or both!