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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 516 · 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. 1.21² =
  2. 2.59² =
  3. 3.89² =
  4. 4.89² =
  5. 5.91² =
  6. 6.21² =
  7. 7.19² =
  8. 8.89² =
  9. 9.81² =
  10. 10.69² =
  11. 11.59² =
  12. 12.31² =
  13. 13.59² =
  14. 14.79² =
  15. 15.39² =
  16. 16.31² =
  17. 17.31² =
  18. 18.31² =
  19. 19.89² =
  20. 20.61² =
  21. 21.89² =
  22. 22.89² =
  23. 23.31² =
  24. 24.89² =
  25. 25.39² =
  26. 26.81² =
  27. 27.71² =
  28. 28.29² =
  29. 29.29² =
  30. 30.79² =
  31. 31.31² =
  32. 32.21² =
  33. 33.21² =
  34. 34.91² =
  35. 35.81² =
  36. 36.89² =
  37. 37.19² =
  38. 38.31² =
  39. 39.19² =
  40. 40.19² =

Answer key

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

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