Use a number line to identify if you need to round up or round down. The whole numbers are equally spaced on this number line. The values increase by each step to the right.

Master the Make 10 strategy to add numbers quickly and accurately. Check simple examples and tips for students to boost mental math skills.

Together, rational and irrational numbers make up the real numbers, which include any number on the number line and which lack the imaginary number i. The majority of real numbers are irrational.