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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 592 · 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. 1.89² =
  2. 2.51² =
  3. 3.89² =
  4. 4.29² =
  5. 5.39² =
  6. 6.41² =
  7. 7.31² =
  8. 8.79² =
  9. 9.21² =
  10. 10.41² =
  11. 11.31² =
  12. 12.81² =
  13. 13.89² =
  14. 14.59² =
  15. 15.19² =
  16. 16.79² =
  17. 17.69² =
  18. 18.79² =
  19. 19.31² =
  20. 20.81² =
  21. 21.29² =
  22. 22.69² =
  23. 23.39² =
  24. 24.39² =
  25. 25.79² =
  26. 26.51² =
  27. 27.39² =
  28. 28.89² =
  29. 29.91² =
  30. 30.49² =
  31. 31.89² =
  32. 32.81² =
  33. 33.21² =
  34. 34.41² =
  35. 35.89² =
  36. 36.79² =
  37. 37.71² =
  38. 38.59² =
  39. 39.79² =
  40. 40.51² =

Answer key

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

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