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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 915 · 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. 1.49² =
  2. 2.19² =
  3. 3.89² =
  4. 4.71² =
  5. 5.71² =
  6. 6.81² =
  7. 7.61² =
  8. 8.21² =
  9. 9.19² =
  10. 10.39² =
  11. 11.91² =
  12. 12.71² =
  13. 13.91² =
  14. 14.89² =
  15. 15.49² =
  16. 16.79² =
  17. 17.79² =
  18. 18.79² =
  19. 19.49² =
  20. 20.81² =
  21. 21.89² =
  22. 22.81² =
  23. 23.51² =
  24. 24.19² =
  25. 25.29² =
  26. 26.19² =
  27. 27.69² =
  28. 28.29² =
  29. 29.81² =
  30. 30.79² =
  31. 31.59² =
  32. 32.21² =
  33. 33.41² =
  34. 34.59² =
  35. 35.69² =
  36. 36.19² =
  37. 37.41² =
  38. 38.79² =
  39. 39.41² =
  40. 40.59² =

Answer key

  1. 2401
  2. 361
  3. 7921
  4. 5041
  5. 5041
  6. 6561
  7. 3721
  8. 441
  9. 361
  10. 1521
  11. 8281
  12. 5041
  13. 8281
  14. 7921
  15. 2401
  16. 6241
  17. 6241
  18. 6241
  19. 2401
  20. 6561
  21. 7921
  22. 6561
  23. 2601
  24. 361
  25. 841
  26. 361
  27. 4761
  28. 841
  29. 6561
  30. 6241
  31. 3481
  32. 441
  33. 1681
  34. 3481
  35. 4761
  36. 361
  37. 1681
  38. 6241
  39. 1681
  40. 3481

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