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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 460 · 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. 2.29² =
  3. 3.81² =
  4. 4.49² =
  5. 5.51² =
  6. 6.21² =
  7. 7.69² =
  8. 8.31² =
  9. 9.81² =
  10. 10.71² =
  11. 11.41² =
  12. 12.29² =
  13. 13.89² =
  14. 14.79² =
  15. 15.49² =
  16. 16.61² =
  17. 17.81² =
  18. 18.89² =
  19. 19.69² =
  20. 20.29² =
  21. 21.19² =
  22. 22.49² =
  23. 23.31² =
  24. 24.29² =
  25. 25.41² =
  26. 26.59² =
  27. 27.49² =
  28. 28.41² =
  29. 29.41² =
  30. 30.79² =
  31. 31.59² =
  32. 32.29² =
  33. 33.89² =
  34. 34.29² =
  35. 35.39² =
  36. 36.19² =
  37. 37.89² =
  38. 38.71² =
  39. 39.91² =
  40. 40.31² =

Answer key

  1. 3481
  2. 841
  3. 6561
  4. 2401
  5. 2601
  6. 441
  7. 4761
  8. 961
  9. 6561
  10. 5041
  11. 1681
  12. 841
  13. 7921
  14. 6241
  15. 2401
  16. 3721
  17. 6561
  18. 7921
  19. 4761
  20. 841
  21. 361
  22. 2401
  23. 961
  24. 841
  25. 1681
  26. 3481
  27. 2401
  28. 1681
  29. 1681
  30. 6241
  31. 3481
  32. 841
  33. 7921
  34. 841
  35. 1521
  36. 361
  37. 7921
  38. 5041
  39. 8281
  40. 961

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