![What is Ziffle?](/sites/default/files/styles/medium/public/thumbnails/content-99-06-penta3-icon.png?itok=T3AtJLO0)
![Abundant Numbers](/sites/default/files/styles/medium/public/thumbnails/content-00-07-penta3-icon.gif?itok=onfyrFo1)
problem
Abundant Numbers
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?
![Make 100](/sites/default/files/styles/medium/public/thumbnails/content-00-07-penta5-icon.jpg?itok=FYf8VMSG)
problem
Make 100
Find at least one way to put in some operation signs to make these digits come to 100.
![Factor Lines](/sites/default/files/styles/medium/public/thumbnails/content-02-10-penta5-icon.gif?itok=RIygcdS8)
problem
Factor Lines
Arrange the four number cards on the grid, according to the rules, to make a diagonal, vertical or horizontal line.
![Which is quicker?](/sites/default/files/styles/medium/public/thumbnails/content-03-09-letme2-icon.gif?itok=Txz6gtCb)
problem
Which is quicker?
Which is quicker, counting up to 30 in ones or counting up to 300 in tens? Why?