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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 284 · 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. 1.59² =
  2. 2.21² =
  3. 3.59² =
  4. 4.61² =
  5. 5.29² =
  6. 6.79² =
  7. 7.69² =
  8. 8.39² =
  9. 9.89² =
  10. 10.21² =
  11. 11.81² =
  12. 12.59² =
  13. 13.69² =
  14. 14.19² =
  15. 15.41² =
  16. 16.89² =
  17. 17.31² =
  18. 18.59² =
  19. 19.69² =
  20. 20.39² =
  21. 21.29² =
  22. 22.29² =
  23. 23.31² =
  24. 24.61² =
  25. 25.39² =
  26. 26.19² =
  27. 27.69² =
  28. 28.89² =
  29. 29.49² =
  30. 30.59² =
  31. 31.81² =
  32. 32.89² =
  33. 33.89² =
  34. 34.61² =
  35. 35.91² =
  36. 36.81² =
  37. 37.31² =
  38. 38.79² =
  39. 39.19² =
  40. 40.31² =

Answer key

  1. 3481
  2. 441
  3. 3481
  4. 3721
  5. 841
  6. 6241
  7. 4761
  8. 1521
  9. 7921
  10. 441
  11. 6561
  12. 3481
  13. 4761
  14. 361
  15. 1681
  16. 7921
  17. 961
  18. 3481
  19. 4761
  20. 1521
  21. 841
  22. 841
  23. 961
  24. 3721
  25. 1521
  26. 361
  27. 4761
  28. 7921
  29. 2401
  30. 3481
  31. 6561
  32. 7921
  33. 7921
  34. 3721
  35. 8281
  36. 6561
  37. 961
  38. 6241
  39. 361
  40. 961

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