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# More Playing with Number Upper Primary

### Zios and Zepts

### Abundant Numbers

### Make 100

### Four Goodness Sake

### Factor Lines

### Which Is Quicker?

### Arrays, Multiplication and Division

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Age 7 to 11

Challenge Level

On the planet Vuv there are two sorts of creatures. The Zios have 3 legs and the Zepts have 7 legs. The great planetary explorer Nico counted 52 legs. How many Zios and how many Zepts were there?

Age 7 to 11

Challenge Level

48 is called an abundant number because it is less than the sum of its factors (without itself). Can you find some more abundant numbers?

Age 7 to 11

Challenge Level

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

Age 7 to 11

Challenge Level

Use 4 four times with simple operations so that you get the answer 12. Can you make 15, 16 and 17 too?

Age 7 to 14

Challenge Level

Arrange the four number cards on the grid, according to the rules, to make a diagonal, vertical or horizontal line.

Age 7 to 11

Challenge Level

Which is quicker, counting up to 30 in ones or counting up to 300 in tens? Why?

Age 5 to 11

This article explores the use of the array to support children's thinking around multiplication and division.