The average of 9 and 13 is ____., 13, 11, 10, 12, The average of 25 and 17 is ____., 22, 20, 21, 19, 40 dm² = ____ cm², 40, 40000, 400, 4000, 900 mm² = ____ cm², 9, 900, 90, 0.9, 1 000 dm² = ____ m², 100, 1000, 10, 1, The sum of two numbers is 36. The difference is 12. The greater number is ____., 12, 18, 30, 24, The sum of two numbers is 41. The difference is 17. The smaller number is ____., 12, 17, 24, 29, Nam has 150 000 dong. Hoa has 50 000 more money than Nam. Hoa has ____ dong., 150 000, 200 000, 100 000, 250 000, An has 42 books. Lan has 18 less books than An. Lan has ____ books., 24, 18, 60, 30

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