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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 357 · 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. 2.31² =
  3. 3.19² =
  4. 4.19² =
  5. 5.79² =
  6. 6.79² =
  7. 7.29² =
  8. 8.29² =
  9. 9.49² =
  10. 10.61² =
  11. 11.49² =
  12. 12.21² =
  13. 13.19² =
  14. 14.49² =
  15. 15.41² =
  16. 16.69² =
  17. 17.31² =
  18. 18.59² =
  19. 19.89² =
  20. 20.89² =
  21. 21.69² =
  22. 22.81² =
  23. 23.69² =
  24. 24.91² =
  25. 25.59² =
  26. 26.19² =
  27. 27.91² =
  28. 28.29² =
  29. 29.89² =
  30. 30.51² =
  31. 31.19² =
  32. 32.89² =
  33. 33.61² =
  34. 34.39² =
  35. 35.61² =
  36. 36.41² =
  37. 37.91² =
  38. 38.81² =
  39. 39.31² =
  40. 40.61² =

Answer key

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

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