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Name: _____________________________________________________ Chapter 2 Review estimate prime number product Vocabulary WORD BANK factor rounding reasonable greatest common factor product least common factor multiple composite number quotient Choose the correct word. 1. You can ___________________________ to check that an answer is reasonable. 2. 4 is a ______________ of 12, and 12 is a __________________ of 4. 3. When one number is multiplied by another, the result is called a _______________________. 4. A number that has only 2 different factors is a __________________________. 5. The _______________________________________ of two or more numbers is less than all other common multiples. Find each sum or difference. Then use rounding to check that your answers are reasonable. Round each number to its greatest place value. 6. 62 + 23 = Sum: _______________________ Estimated Value:______________ 7. 146 – 48 = Difference:_____________________ Estimated Value:_________________ 8. 537 + 219 = Sum:__________________________ Estimated Value: ________________ 9. 806 – 274 = Difference: _____________________ Estimated Value:_________________ Find each product. Then estimate to check that your answers are reasonable. 10. 35 x 3 = Product: _______________________ Estimated Value:_________________ 11. 253 x 4 Product:________________________ Estimated Value:_________________ Complete. Then estimate to check that your answers are reasonable. 12. 7,036 + 1,598 = Sum: _____________________ Estimated Value:____________ 13. 479 – 247 = Difference: ________________ Estimated Value:____________ 14. 3,862 – 2,973 = Difference:________________ Estimated Value:____________ 15. 46 x 5 = Product: __________________ Estimated Value: ___________ 16. 63 x 4 = Product:__________________ Estimated Value:____________ 17. 32 x 3 = Product: __________________ Estimated Value: ___________ 18. 104 x 4 = Product:__________________ Estimated Value:____________ Find the factors of each number. 19. 16 - ___________________________________________________ 20. 24 - ___________________________________________________ Complete. 21. Find the common factors of 16 and 24. ________________________ 22. Find the greatest common factor of 16 and 24. __________________ Find the first eight multiples of each number. 23. 4 - ______ , ______ , ______ , ______ , ______ , ______ , ______ , ______ 24. 6 - ______ , ______ , ______ , ______ , ______ , ______ , ______ , ______ Complete. 25. Find a common multiple of 4 and 6. __________ 26. The least common multiple of 4 and 6 is ___________. Find the factors of each number. Then list the prime numbers and composite numbers. 17 27. 24 9 27 16 11 Prime Numbers: ________________________________ Composite Numbers: _____________________________ Solve. 28. Joey has 38 oranges. He packs them into 4 crates. How many oranges does he have left over? 29. There are 158 erasers, 235 pencils, and 369 pens in a stationery shop. About how many erasers, pencils, and pens are there altogether? 31. A tourist agency is expecting 65 visitors in a week. Each of the agency’s cars can carry 4 passengers. How many cars will be needed for all the visitors?