Mental calculations

This problem is designed to help children to learn, and to use, the two and three times tables.

Can you use the information to find out which cards I have used?

Can you go through this maze so that the numbers you pass add to exactly 100?

What do you notice about these squares of numbers? What is the same? What is different?

Choose a symbol to put into the number sentence.

Noah saw 12 legs walk by into the Ark. How many creatures did he see?

Find at least one way to put in some operation signs to make these digits come to 100.

Tim had nine cards each with a different number from 1 to 9 on it. How could he have put them into three piles so that the total in each pile was 15?