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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 752 · 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. 1.51² =
  2. 2.39² =
  3. 3.89² =
  4. 4.39² =
  5. 5.19² =
  6. 6.19² =
  7. 7.79² =
  8. 8.19² =
  9. 9.61² =
  10. 10.21² =
  11. 11.79² =
  12. 12.69² =
  13. 13.19² =
  14. 14.31² =
  15. 15.61² =
  16. 16.31² =
  17. 17.59² =
  18. 18.81² =
  19. 19.91² =
  20. 20.31² =
  21. 21.19² =
  22. 22.39² =
  23. 23.49² =
  24. 24.81² =
  25. 25.91² =
  26. 26.69² =
  27. 27.31² =
  28. 28.21² =
  29. 29.91² =
  30. 30.31² =
  31. 31.19² =
  32. 32.21² =
  33. 33.91² =
  34. 34.59² =
  35. 35.81² =
  36. 36.21² =
  37. 37.59² =
  38. 38.19² =
  39. 39.81² =
  40. 40.61² =

Answer key

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

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