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### Number and algebra

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### Working mathematically

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### Advanced mathematics

# More Playing with Numbers Upper Primary

### Abundant Numbers

### Make 100

### Factor Lines

### Which Is Quicker?

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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 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?