Addition & subtraction strategies to solve two-digit equations using an open number line.

SUBJECTS: Maths YEARS: F–2 Learn the "counting back" strategy to help you solve tricky subtraction problems. In this lesson, Miss James demonstrates how to use a number line correctly, and she ...

Using subtraction There are two ways to find the answer to subtraction calculations. First, you could start on the smaller number and count up to reach the bigger number. This works if the two ...

Subtraction with exchange Sometimes a digit from the second number is larger than the digit in the first number. This means it can't be directly subtracted.