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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 615 · 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. 2.79² =
  3. 3.69² =
  4. 4.59² =
  5. 5.51² =
  6. 6.19² =
  7. 7.49² =
  8. 8.79² =
  9. 9.39² =
  10. 10.29² =
  11. 11.49² =
  12. 12.41² =
  13. 13.81² =
  14. 14.29² =
  15. 15.19² =
  16. 16.81² =
  17. 17.89² =
  18. 18.39² =
  19. 19.89² =
  20. 20.91² =
  21. 21.89² =
  22. 22.89² =
  23. 23.69² =
  24. 24.19² =
  25. 25.89² =
  26. 26.39² =
  27. 27.31² =
  28. 28.51² =
  29. 29.81² =
  30. 30.71² =
  31. 31.81² =
  32. 32.59² =
  33. 33.81² =
  34. 34.81² =
  35. 35.39² =
  36. 36.41² =
  37. 37.81² =
  38. 38.21² =
  39. 39.89² =
  40. 40.29² =

Answer key

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

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