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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 265 · 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. 1.29² =
  2. 2.49² =
  3. 3.79² =
  4. 4.31² =
  5. 5.29² =
  6. 6.79² =
  7. 7.39² =
  8. 8.79² =
  9. 9.39² =
  10. 10.69² =
  11. 11.29² =
  12. 12.31² =
  13. 13.39² =
  14. 14.69² =
  15. 15.21² =
  16. 16.61² =
  17. 17.69² =
  18. 18.89² =
  19. 19.89² =
  20. 20.31² =
  21. 21.39² =
  22. 22.51² =
  23. 23.49² =
  24. 24.69² =
  25. 25.21² =
  26. 26.21² =
  27. 27.29² =
  28. 28.31² =
  29. 29.21² =
  30. 30.61² =
  31. 31.79² =
  32. 32.61² =
  33. 33.79² =
  34. 34.81² =
  35. 35.59² =
  36. 36.69² =
  37. 37.81² =
  38. 38.19² =
  39. 39.39² =
  40. 40.79² =

Answer key

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

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