The mental math technique of compensation to find the sum was used in Mental Math: Subtraction Using Compensation.
Adjusting one of the addends to make the equation easier to solve is a mental math strategy called compensation.Some students prefer this strategy over left-to-right addition or breaking up the second number strategy.
It is possible to make equations easier to solve with compensation.It encourages students to think outside of the box.
We will add 34+50 since 49 is so close to 50.It's easier to solve.We have to subtract one from the final answer since we added one extra to the equation.
We want to solve the equation.The two numbers can be added with compensation.There is no way to perform the strategy with compensation.Take 4 away from the 64 and add 132+60 to make 192.The equation is easy to solve.We have to add 4 to the answer since we subtracted 4 from the equation.192+4 is a number.