Multiplying with Estimation and Rounding Worksheet

Instructions: Solve the following problems using estimation and rounding techniques. Round to the nearest whole number unless otherwise specified.

1. Multiply 45 by 32
2. Multiply 67 by 89
3. Multiply 3.7 by 8.2
4. Multiply 98.6 by 5.4
5. Multiply 23 by 17.5
6. Multiply 6.8 by 9.3
7. Multiply 123 by 456
8. Multiply 789 by 321
9. Multiply 4.6 by 7.9
10. Multiply 48.9 by 2.5

Round to the nearest tenth and estimate the product.

11. 4.7 x 2.9
12. 8.3 x 7.6
13. 1.2 x 5.9
14. 9.8 x 2.5
15. 6.4 x 3.7

Use estimation to determine which of the following products is the largest.

16. 87 x 14
17. 92 x 13
18. 84 x 16
19. 79 x 19
20. 81 x 17

Use estimation to determine which of the following products is the smallest.

21. 35 x 12
22. 42 x 9
23. 27 x 16
24. 23 x 19
25. 18 x 21

Round to the nearest hundredth and estimate the product.

26. 5.67 x 2.34
27. 8.91 x 4.57
28. 1.23 x 6.78
29. 9.87 x 2.54
30. 6.43 x 3.76

Round to the nearest thousandth and estimate the product.

31. 45.678 x 23.456
32. 67.891 x 89.123
33. 12.345 x 56.789
34. 98.765 x 43.210
35. 23.456 x 17.890

Use estimation to solve the following word problems.

36. A truck can carry 4.5 tons of weight. How many tons can 7 trucks carry?
37. A bookshelf has 5 shelves. Each shelf can hold 15 books. How many books can the bookshelf hold in total?
38. A bag of rice weighs 2.3 pounds. How much does 8 bags of rice weigh in total?
39. A classroom has 35 students. Each student has 3 pencils. How many pencils are there in total?
40. A pack of gum costs $1.25. If you buy 4 packs of gum, how much will it cost you in total?

Round to the nearest ten thousand and estimate the product.

41. 3,456 x 8,923
42. 7,891 x 4,321
43. 2,345 x 6,789
44. 9,876 x 5,432
45. 2,345 x 1,789

Round to the nearest hundred thousand and estimate the product.

46. 23,456 x 17,890
47. 98,765 x 43,210
48. 45,678 x 23,456
49. 67,891 x 89,123
50. 12,345 x 56,789

Use estimation to determine the approximate answer.

51. 23,456 x 1,234.56
52. 9,876 x 7.89
53. 6,789 x 4.32
54. 98.76 x 54.32
55. 23.45 x 67.89

Round to the nearest hundred and estimate the product.

56. 56 x 89
57. 34 x 67
58. 41 x 58
59. 75 x 29
60. 82 x 47

Round to the nearest hundred and estimate the product. Include units.

61. A rectangle has a length of 15.6 cm and a width of 8.2 cm. What is the area of the rectangle?
62. A swimming pool has a length of 25.4 meters and a width of 12.8 meters. What is the area of the pool?
63. A box has a height of 9.3 inches, a length of 7.6 inches, and a width of 4.8 inches. What is the volume of the box?
64. A cylindrical tank has a diameter of 12.5 meters and a height of 18.9 meters. What is the volume of the tank?
65. A triangular prism has a base with a length of 8.4 meters and a height of 6.2 meters. The prism has a height of 3.5 meters. What is the volume of the prism?

Round to the nearest hundredth and estimate the answer.

66. 23.45 / 6.78
67. 67.89 / 9.87
68. 98.76 / 5.43
69. 4.32 / 1.23
70. 56.78 / 2.34

Round to the nearest ten and estimate the answer.

71. 345 + 678
72. 456 + 789
73. 567 + 891
74. 678 + 912
75. 789 + 123

Round to the nearest hundred and estimate the answer.

76. 1,234 + 5,678
77. 6,789 + 2,345
78. 9,876 + 4,321
79. 3,456 + 7,891
80. 2,345 + 6,789

Round to the nearest ten and estimate the answer. Include units.

81. If a truck travels 45 miles in 2.5 hours, how fast is it going?
82. If you walk 10,000 steps in a day, how many steps will you walk in a week?
83. If a parcel weighs 3.2 pounds and you have to ship 50 of them, how much will they weigh in total?
84. If a recipe calls for 2 cups of flour and you want to make 10 cupcakes, how much flour do you need?
85. If a bottle of water contains 500 ml and you drink 3 bottles a day, how much water do you drink in a week?

Round to the nearest hundredth and estimate the answer.

86. 23.45 + 6.78
87. 67.89 + 9.87
88. 98.76 + 5.43
89. 4.32 + 1.23
90. 56.78 + 2.34

Round to the nearest thousand and estimate the answer.

91. 345 + 678 + 901
92. 234 + 567 + 890
93. 123 + 456 + 789
94. 345 + 678 + 901 + 234
95. 123 + 456 + 789 + 890

Round to the nearest ten thousand and estimate the answer.

96. 12,345 + 67,890 + 23,456
97. 98,765 + 43,210 + 56,789
98. 34,567 + 89,012 + 12,345
99. 23,456 + 78,901 + 45,678 + 90,123
100. 67,890 + 12,345 + 23,456 + 56,789