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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 757 · 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. 2.39² =
  3. 3.69² =
  4. 4.39² =
  5. 5.79² =
  6. 6.21² =
  7. 7.61² =
  8. 8.81² =
  9. 9.41² =
  10. 10.91² =
  11. 11.39² =
  12. 12.19² =
  13. 13.69² =
  14. 14.79² =
  15. 15.61² =
  16. 16.49² =
  17. 17.51² =
  18. 18.21² =
  19. 19.81² =
  20. 20.21² =
  21. 21.49² =
  22. 22.91² =
  23. 23.31² =
  24. 24.31² =
  25. 25.21² =
  26. 26.59² =
  27. 27.19² =
  28. 28.39² =
  29. 29.21² =
  30. 30.39² =
  31. 31.59² =
  32. 32.29² =
  33. 33.49² =
  34. 34.51² =
  35. 35.61² =
  36. 36.49² =
  37. 37.51² =
  38. 38.79² =
  39. 39.41² =
  40. 40.19² =

Answer key

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

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