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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 442 · 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. 1.79² =
  2. 2.71² =
  3. 3.19² =
  4. 4.41² =
  5. 5.21² =
  6. 6.21² =
  7. 7.59² =
  8. 8.31² =
  9. 9.49² =
  10. 10.79² =
  11. 11.49² =
  12. 12.81² =
  13. 13.19² =
  14. 14.61² =
  15. 15.69² =
  16. 16.69² =
  17. 17.61² =
  18. 18.19² =
  19. 19.21² =
  20. 20.61² =
  21. 21.91² =
  22. 22.21² =
  23. 23.41² =
  24. 24.49² =
  25. 25.69² =
  26. 26.19² =
  27. 27.81² =
  28. 28.51² =
  29. 29.91² =
  30. 30.29² =
  31. 31.41² =
  32. 32.21² =
  33. 33.31² =
  34. 34.89² =
  35. 35.69² =
  36. 36.71² =
  37. 37.89² =
  38. 38.89² =
  39. 39.49² =
  40. 40.31² =

Answer key

  1. 6241
  2. 5041
  3. 361
  4. 1681
  5. 441
  6. 441
  7. 3481
  8. 961
  9. 2401
  10. 6241
  11. 2401
  12. 6561
  13. 361
  14. 3721
  15. 4761
  16. 4761
  17. 3721
  18. 361
  19. 441
  20. 3721
  21. 8281
  22. 441
  23. 1681
  24. 2401
  25. 4761
  26. 361
  27. 6561
  28. 2601
  29. 8281
  30. 841
  31. 1681
  32. 441
  33. 961
  34. 7921
  35. 4761
  36. 5041
  37. 7921
  38. 7921
  39. 2401
  40. 961

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