Skip count backward by fives to
subtract five. What is 18 take away five? What is 13 take away five? And what is eight take away
The question tells us to skip count
backward by fives to help us subtract five each time. And we can see the first
subtraction has already been done. We started at 23 and skip counted
backward by five, 23, 22, 21, 20, 19, 18. 23 take away five is 18. We skip counted backward by fives
to help us subtract five.
Next, we need to calculate 18 take
away five. So, we need to start at 18 and skip
count backward by fives to subtract five, 18, 17, 16, 15, 14, 13. 18 subtract five is 13. Next, we have to calculate 13 take
away five. Start at 13 and count backward by
five, 12, 11, 10, nine, eight. 13 subtract five is eight.
Now we just need to work out the
final calculation eight take away five. We need to start at eight and count
back five, seven, six, five, four, three. We used the number line to help us
skip count backward by fives to subtract five. 18 take away five is 13. 13 take away five is eight. And eight take away five is