Alien Gem Traders

About this quiz

What this quiz asks

1. A friendly alien has 12 glowing blue crystals. He finds 7 more. How many crystals does he have in total?
2. An alien counts 25 crystals in a crate. He then adds 14 more from his bag. How many crystals are in the crate now?
3. An alien had 48 crystals but lost 16 in a meteor shower. How many crystals remain?
4. An alien has 15 red crystals and 20 green crystals. He trades away 8 crystals. How many does he have now?
5. An alien has 12 moons orbiting their planet. They gain 7 more moons from a trade. How many total moons are orbiting now?
6. A space station has 24 moons. A passing fleet adds 18 more moons to the station's orbit. How many total moons are there?
7. An alien has 15 moons. They find 9 more, then gain 6 more from a friend. How many moons total?
8. You have 22 moons. You trade away 5, but then find 13 new ones. How many moons do you have now?
9. Zog the alien has 25 glowing crystals. He gives 8 crystals to a friend. How many crystals does Zog have left?
10. A space trader has 42 space gems in a pile. They sell 15 gems to an explorer. How many gems are left in the pile?
11. An alien has 48 crystals. He loses 19 of them in a meteor shower. How many crystals does he have now?
12. A trader starts with 50 crystals. She trades 22 away for food. Then she trades 6 more away for fuel. How many crystals remain?
13. An alien has 15 red crystals and 12 blue crystals. Which comparison shows the correct relationship between the crystal groups?
14. An alien trades 22 green crystals for 28 yellow crystals. Which statements correctly compare the two groups?
15. Group A has 40 crystals and Group B has 40 crystals. Which math sentences correctly compare these groups?
16. An alien has 35 crystals. They trade for more until they have 48. Which comparisons describe the change?
17. An alien trades 12 blue crystals for 8 red ones. If the trade is balanced by adding moons, how many moons are needed to make both sides equal 20?
18. An alien has 15 crystals. They trade away 7 but gain 10 moons. What is the final value if a crystal is worth 2 moons?
19. Alien A has 20 crystals. Alien B has 35 moons. If 1 crystal equals 1.5 moons, how many crystals must Alien A give to Alien B to balance the trade?
20. An alien trades 10 crystals and 5 moons for 25 moons. If the trade is fair, what is the value of 1 crystal in moons?
21. Zog has 12 glowing crystals. He trades some away and has 5 left. How many crystals did Zog trade?
22. A space trader needs 42 moons to power his ship. He currently has 28 moons. How many more moons does he need?
23. After receiving 15 new crystals as a gift, a collector now has 48 crystals total. How many did they have before?
24. A trader starts with 50 gems. He gives away 12 and then receives some more. He now has 45. How many did he receive?

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