Take this quiz to see how much you know about this topic already, then work through the guide and see if you can beat your score. Take a look at this number line. It shows 14 - 5 = 9. You can count ...

Mrs. McCartney talks addition with D.C.; practices hopping the numberline with Springling. Join Mrs. McCartney for an addition number talk with D.C.! Get your hopping skills ready so you can see our ...

Subtracting larger numbers in your head is not always easy, so you can use the column method to take one number away from another. You write the larger number above the smaller number, so that the ...