Addition & subtraction strategies to solve two-digit equations using an open number line. In this lesson, students go over using different addition and subtraction strategies to solve two-digit ...

Use visual models to practice adding and subtracting lengths of objects within 100. Warm up with a Mystery Math Mistake to find the mistake made in counting up on a number line to subtract. Use visual ...

You can add or subtract numbers in lots of different ways. You can use number lines, number bonds, fact families, 10 squares and counters, or even just writing the numbers down. Sometimes it is faster ...