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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 546 · 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. 1.21² =
  2. 2.31² =
  3. 3.31² =
  4. 4.31² =
  5. 5.69² =
  6. 6.79² =
  7. 7.59² =
  8. 8.29² =
  9. 9.59² =
  10. 10.79² =
  11. 11.81² =
  12. 12.59² =
  13. 13.69² =
  14. 14.69² =
  15. 15.41² =
  16. 16.31² =
  17. 17.61² =
  18. 18.61² =
  19. 19.79² =
  20. 20.31² =
  21. 21.81² =
  22. 22.69² =
  23. 23.19² =
  24. 24.79² =
  25. 25.79² =
  26. 26.49² =
  27. 27.59² =
  28. 28.19² =
  29. 29.59² =
  30. 30.39² =
  31. 31.41² =
  32. 32.29² =
  33. 33.91² =
  34. 34.79² =
  35. 35.81² =
  36. 36.59² =
  37. 37.61² =
  38. 38.59² =
  39. 39.41² =
  40. 40.89² =

Answer key

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

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