In this activity, we will work out a subtraction by counting on using a number line.
Example
Work out 73 - 38 =
We use the number line to count up from the smaller number to the larger number.
First step: go to the next ten, i.e. 40 here (38 + 2 = 40)
Second step: count up in tens to the ten below your given number, i.e. 70 here (40 + 30 = 70)
Third step: count up to the given number, i.e. 73 here (70 + 3 = 73)
Answer is 2 + 30 + 3 = 35
So we can see that 73 - 38 = 35
Don't worry if that looks a bit tricky, we'll go through lots of questions together and hopefully, it will soon become easy!
View the activity introduction for more information on the topic
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Question
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Teacher explanation