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Grouping Goodies

Pat counts her sweets in different groups and both times she has some left over. How many sweets could she have had?

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What Number?

I am less than 25. My ones digit is twice my tens digit. My digits add up to an even number.

Largest Even

Stage: 1 Challenge Level: Challenge Level:1
What do you know about even numbers?
What do you know about the units digit of even numbers?
Where could the digit on the first card go - in the units or tens? Why?
How can you make a large number?
How do you know that's the biggest even number you can make?