Emek and Luna reached a river where a bridge was made of numbered stones. A sign said each safe step must show a total of 10. They found pairs of stones labeled 3 and 7, 6 and 4, and 8 and 2. They also noticed that stepping on the stone labeled 10 was another safe choice. By combining numbers to make 10, they crossed the bridge safely and happily continued their adventure.
Challenges
Challenge 1 of 5
Challenges
Challenge 1 of 4
Hint
Add the two numbers and look for a total of 10.
Which pair of stones makes a safe total of 10?
5 and 55 and 46 and 37 and 2Correct! 5 + 5 = 10, so it is a safe pair.
Not quite. Add each pair and find the one that equals 10.
Next🎉 Congrats! You got this question!
Hint
Think about what number added to 6 equals 10.
Emek stands on the stone labeled 6. What number must the next stone show to make a safe total of 10?
Correct! 6 and 4 make 10.
Try finding the missing number in 6 + ? = 10.
Next🎉 Congrats! You got this question!
Hint
Read what the sign says about safe steps.
Why was stepping on the stone labeled 10 also a safe choice?
Because 10 is bigger than all the other numbers.Because the stone already shows a total of 10.Because 10 and 2 make 12.Because every stone with an even number is safe.Correct! The stone labeled 10 already shows the safe total.
Not quite. A safe step must show a total of 10.
Next🎉🎉🎉🎉🎉🎉🎉🎉
🎉 Congrats! You finished this challenge set!
