12 - 5 = 7 Just like with addition, we can use a part-whole model to help partition larger numbers to make them easier to deal with in subtraction problems. First, partition 35 into 30 and 5.

Previously in Massachusetts, students were introduced to the algorithm for multi-digit addition and subtraction in 2nd grade. In California, students learned the algorithms for addition ...

Ellis showed a subtraction problem, performed both using the traditional regrouping, or borrow-and-carry, algorithm and using ... demonstrating fluency for addition and subtraction within 10.

Here you will find a video about addition and subtraction. Watch this, and then test your knowledge with a short quiz before exploring the rest of the collection. This section contains videos from ...