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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 995 · 40 questions
TalentJR

The fast method (Step from a neighbour): Find the round neighbour and square it: 70² = 7 × 7 = 49, then two 0s → 4900. Ends in 1 (one more)? Add the round number and the number: 4900 + 70 + 71. Ends in 9 (one less)? Take them away: 69² = 4900 − 70 − 69 = 4761.

NameDateTime takenScore ___ / 40
  1. 1.19² =
  2. 2.61² =
  3. 3.79² =
  4. 4.41² =
  5. 5.51² =
  6. 6.19² =
  7. 7.49² =
  8. 8.59² =
  9. 9.91² =
  10. 10.89² =
  11. 11.41² =
  12. 12.71² =
  13. 13.21² =
  14. 14.39² =
  15. 15.89² =
  16. 16.39² =
  17. 17.21² =
  18. 18.49² =
  19. 19.21² =
  20. 20.19² =
  21. 21.59² =
  22. 22.41² =
  23. 23.91² =
  24. 24.81² =
  25. 25.71² =
  26. 26.69² =
  27. 27.19² =
  28. 28.91² =
  29. 29.19² =
  30. 30.19² =
  31. 31.41² =
  32. 32.91² =
  33. 33.71² =
  34. 34.41² =
  35. 35.41² =
  36. 36.21² =
  37. 37.61² =
  38. 38.21² =
  39. 39.71² =
  40. 40.91² =

Answer key

  1. 361
  2. 3721
  3. 6241
  4. 1681
  5. 2601
  6. 361
  7. 2401
  8. 3481
  9. 8281
  10. 7921
  11. 1681
  12. 5041
  13. 441
  14. 1521
  15. 7921
  16. 1521
  17. 441
  18. 2401
  19. 441
  20. 361
  21. 3481
  22. 1681
  23. 8281
  24. 6561
  25. 5041
  26. 4761
  27. 361
  28. 8281
  29. 361
  30. 361
  31. 1681
  32. 8281
  33. 5041
  34. 1681
  35. 1681
  36. 441
  37. 3721
  38. 441
  39. 5041
  40. 8281

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