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Numbers as Shapes

Use cubes to continue making the numbers from 7 to 20. Are they sticks, rectangles or squares?

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How Odd

This problem challenges you to find out how many odd numbers there are between pairs of numbers. Can you find a pair of numbers that has four odds between them?

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?