What is the missing number?
We’re shown a number line. It starts at number 12 and ends at
number 22. We have to find the missing
number. We know the gap between the numbers
is one. We’re counting in ones on this
number line. 12, 13, 14, 15. Which number comes after 15? It’s number 16. The missing number is 16. We found the number by counting in
ones from number 12 on the number line.