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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 249 · 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. 1.29² =
  2. 2.21² =
  3. 3.21² =
  4. 4.51² =
  5. 5.69² =
  6. 6.59² =
  7. 7.29² =
  8. 8.19² =
  9. 9.29² =
  10. 10.79² =
  11. 11.91² =
  12. 12.19² =
  13. 13.59² =
  14. 14.31² =
  15. 15.91² =
  16. 16.59² =
  17. 17.89² =
  18. 18.41² =
  19. 19.31² =
  20. 20.61² =
  21. 21.61² =
  22. 22.79² =
  23. 23.19² =
  24. 24.81² =
  25. 25.49² =
  26. 26.91² =
  27. 27.69² =
  28. 28.39² =
  29. 29.79² =
  30. 30.59² =
  31. 31.41² =
  32. 32.21² =
  33. 33.51² =
  34. 34.39² =
  35. 35.31² =
  36. 36.21² =
  37. 37.21² =
  38. 38.59² =
  39. 39.49² =
  40. 40.21² =

Answer key

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

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