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.

My son needed a way to practice his math, and I was working & attending school, so I came up with this. It generates two random 3-digit numbers as arguments for the equation. It also randomly ...