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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 272 · 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. 1.69² =
  2. 2.69² =
  3. 3.81² =
  4. 4.29² =
  5. 5.91² =
  6. 6.89² =
  7. 7.19² =
  8. 8.89² =
  9. 9.89² =
  10. 10.69² =
  11. 11.21² =
  12. 12.79² =
  13. 13.89² =
  14. 14.79² =
  15. 15.49² =
  16. 16.49² =
  17. 17.89² =
  18. 18.79² =
  19. 19.31² =
  20. 20.29² =
  21. 21.69² =
  22. 22.39² =
  23. 23.89² =
  24. 24.69² =
  25. 25.59² =
  26. 26.39² =
  27. 27.61² =
  28. 28.59² =
  29. 29.19² =
  30. 30.39² =
  31. 31.69² =
  32. 32.61² =
  33. 33.81² =
  34. 34.79² =
  35. 35.29² =
  36. 36.41² =
  37. 37.31² =
  38. 38.59² =
  39. 39.81² =
  40. 40.61² =

Answer key

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

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