Emek and Luna reached a rocky valley where numbered stepping stones formed a path. The first safe stones were marked 4, 7, 10, and 13. Luna noticed that each number was 3 more than the one before it. Emek used the rule and added 3 to 13, getting 16. They stepped onto the stone marked 16. Following the same pattern, they chose 19 and then 22. The pattern guided them safely across the valley.
Challenges
Challenge 1 of 5
Challenges
Challenge 1 of 4
Hint
Compare two neighboring numbers, such as 7 and 10.
The safe stepping stones follow the pattern 4, 7, 10, 13, 16, 19, 22. What is the rule for the pattern?
Add 2 each time.Add 3 each time.Add 4 each time.Subtract 3 each time.Correct! Each stepping-stone number is 3 more than the one before it.
Find how much you add to one number to get the next number.
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Hint
Use the same rule that changes 19 into 22.
After Emek and Luna reach the stone marked 22, they see more stones ahead. If the same pattern continues, what number should be on the next safe stone?
Correct! Adding 3 to 22 gives 25.
The pattern increases by 3 each time. Add 3 to 22.
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Hint
Start at 13 and use the add-3 rule.
Suppose a stone marked 14 is beside the safe path. Should Emek and Luna choose it after the stone marked 13?
Yes, because 14 is greater than 13.Yes, because every larger number is part of the pattern.No, because the next safe number should be 15.No, because the next safe number should be 16.Correct! The next safe stone after 13 is 13 + 3 = 16, not 14.
A number belongs on the safe path only if it follows the add-3 pattern.
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