A class is skip counting on a number line. But some of the numbers have been covered in ink. What skip count do the numbers follow? What are the two missing numbers?
We can see the first number on the number line is 274. The second number and the third number have been covered in ink. The fourth number is 304 and the fifth number is 314. We can’t work out the rule by looking at the first part of the number line because two of the numbers are missing. But we are given the last two numbers on the number line: 304 and 314. What are we skip counting by? Twos, fives, tens. How do we get from 304 to 314? We need to add 10. So we can answer the first part of the question. We skip counting in tens.
Now, we can find the first missing number. If we start at 274 and skip count by tens, what number would come next? What number is 10 more than 274. 274 and 10 more is 284. The first missing number is 284. To find the next missing number covered in ink, we need to add 10 to 284, which is 294. The two missing numbers are 284 and 294. And if we were to add 10 to 294, that would take us to 304.
The numbers on the number line are increasing by 10. We skip counting in tens. The two missing numbers are 284 and 294. The numbers are 274, 284, 294, 304, 314. And the two missing numbers are 284 and 294.