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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 327 · 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. 1.41² =
  2. 2.71² =
  3. 3.41² =
  4. 4.31² =
  5. 5.59² =
  6. 6.19² =
  7. 7.69² =
  8. 8.79² =
  9. 9.19² =
  10. 10.69² =
  11. 11.21² =
  12. 12.21² =
  13. 13.59² =
  14. 14.59² =
  15. 15.51² =
  16. 16.29² =
  17. 17.31² =
  18. 18.89² =
  19. 19.19² =
  20. 20.71² =
  21. 21.81² =
  22. 22.29² =
  23. 23.79² =
  24. 24.31² =
  25. 25.31² =
  26. 26.49² =
  27. 27.41² =
  28. 28.31² =
  29. 29.71² =
  30. 30.79² =
  31. 31.91² =
  32. 32.51² =
  33. 33.59² =
  34. 34.51² =
  35. 35.19² =
  36. 36.89² =
  37. 37.89² =
  38. 38.51² =
  39. 39.39² =
  40. 40.51² =

Answer key

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

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