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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 66 · 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. 1.91² =
  2. 2.51² =
  3. 3.79² =
  4. 4.59² =
  5. 5.41² =
  6. 6.29² =
  7. 7.29² =
  8. 8.81² =
  9. 9.21² =
  10. 10.21² =
  11. 11.51² =
  12. 12.89² =
  13. 13.91² =
  14. 14.79² =
  15. 15.19² =
  16. 16.29² =
  17. 17.51² =
  18. 18.39² =
  19. 19.91² =
  20. 20.89² =
  21. 21.41² =
  22. 22.59² =
  23. 23.51² =
  24. 24.19² =
  25. 25.59² =
  26. 26.79² =
  27. 27.51² =
  28. 28.81² =
  29. 29.21² =
  30. 30.59² =
  31. 31.59² =
  32. 32.89² =
  33. 33.91² =
  34. 34.61² =
  35. 35.41² =
  36. 36.49² =
  37. 37.89² =
  38. 38.59² =
  39. 39.69² =
  40. 40.51² =

Answer key

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

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