Students put all of their addition and subtraction skills together to solve equations. In this lesson, students put all of their addition and subtraction skills together to solve equations.

Using addition and subtraction in multi-step problems. OLIVIA AND HASSAN ... Olivia and Hassan's ability to solve large equations using written methods is tested. How and why we round numbers.

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.

For example, Adams and colleagues analysed ... thereby helping us to solve problems through subtraction.