Addition & Subtraction using a numberlinePractise adding and taking away 10 using a numberline.
What changes, what stays the same?
Build your confidence adding and taking away 9 or 11.
e.g. to add 9 just add 10 and then adjust by 1.
When you're ready try the harder levels, use your new skills to solve them.
HAVING TROUBLE LOADING? Please try this version.