More Playing with Numbers Upper Primary

Can you work out what a ziffle is on the planet Zargon?

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?

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

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

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