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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 242 · 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. 2.31² =
  3. 3.89² =
  4. 4.59² =
  5. 5.51² =
  6. 6.19² =
  7. 7.61² =
  8. 8.79² =
  9. 9.89² =
  10. 10.71² =
  11. 11.61² =
  12. 12.89² =
  13. 13.49² =
  14. 14.59² =
  15. 15.39² =
  16. 16.29² =
  17. 17.71² =
  18. 18.31² =
  19. 19.79² =
  20. 20.59² =
  21. 21.39² =
  22. 22.59² =
  23. 23.91² =
  24. 24.89² =
  25. 25.69² =
  26. 26.21² =
  27. 27.89² =
  28. 28.41² =
  29. 29.29² =
  30. 30.19² =
  31. 31.79² =
  32. 32.79² =
  33. 33.71² =
  34. 34.39² =
  35. 35.81² =
  36. 36.51² =
  37. 37.31² =
  38. 38.41² =
  39. 39.49² =
  40. 40.39² =

Answer key

  1. 2601
  2. 961
  3. 7921
  4. 3481
  5. 2601
  6. 361
  7. 3721
  8. 6241
  9. 7921
  10. 5041
  11. 3721
  12. 7921
  13. 2401
  14. 3481
  15. 1521
  16. 841
  17. 5041
  18. 961
  19. 6241
  20. 3481
  21. 1521
  22. 3481
  23. 8281
  24. 7921
  25. 4761
  26. 441
  27. 7921
  28. 1681
  29. 841
  30. 361
  31. 6241
  32. 6241
  33. 5041
  34. 1521
  35. 6561
  36. 2601
  37. 961
  38. 1681
  39. 2401
  40. 1521

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