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Estimating

This resource provides comprehensive guidance on rounding numbers and estimating sums to simplify calculations. Learn how to round to the nearest ten, hundred, thousand, and more with clear examples. Understand the rules for rounding based on whether the digit next door is 5 or more. Enhance your estimation skills through practice problems that involve addition and subtraction, allowing you to quickly determine approximate results. Ideal for students and anyone looking to strengthen their math skills, this guide makes complex concepts accessible and easy to apply.

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Estimating

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  1. Estimating Rounding

  2. Rounding 486,628 If the number next door is 5 or more, we add 1 more. Round to the nearest ten thousand.

  3. hundred thousands hundred millions ten thousands ten millions hundreds thousands millions tens ones 42,632 • 42,600 • 42,700 • 43,000 • 40,000 Round to the nearest hundred.

  4. hundred thousands hundred millions ten thousands ten millions hundreds thousands millions tens ones 24,632 • 24,600 • 24,700 • 25,000 • 20,000 Round to the nearest greatest place.

  5. To estimate sums, we first round the numbers to make them easier to work with. 600 638 492 115 + 375 500 100 400

  6. Estimate: 863 294 511 + 735 • 13,600 • 12,700 • 14,000 • 15,000

  7. Estimate: 544 961 118 5480 + 543 • 7,100 • 7,500 • 6,400 • 6,800

  8. Estimate: 729 768 9,081 + 4,347 • 14,000 • 14,500 • 15,400 • 15,800

  9. Estimate: 77 584 5,356 + 4,578 • 11,000 • 9,500 • 10,000 • 10,680

  10. Estimate: 232 200 1,321 2,364 + 2,983 • 6,400 • 6,000 • 7,100 • 6,680

  11. Estimate: 992 193 1,747 9,524 + 3,496 • 14,400 • 15,000 • 15,952 • 16,200

  12. Estimate: 91.007 + 4.8 • 93 • 94 • 95 • 96

  13. Estimate: 82.992 + 49.194 • 122 • 131 • 132 • 133

  14. Estimate: 39.76 + 21.1 • 60 • 61 • 60.86 • 50

  15. Estimate: 34.75 + 7.4 • 41 • 42 • 43 • 44

  16. Estimate: 43.008 - 6.5 • 36 • 37 • 43 • 44

  17. Estimate: 52.29 - 8.735 • 43 • 44 • 56 • 57

  18. Estimate: 8.023 - 2.5 • 10 • 6 • 5 • 4

  19. Estimate: 9.69 - 6.33 • 15 • 10 • 4 • 3

  20. Estimate: 48.08 - 7.402 • 40 • 41 • 54 • 55

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