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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 581 · 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. 2.49² =
  3. 3.79² =
  4. 4.71² =
  5. 5.49² =
  6. 6.39² =
  7. 7.79² =
  8. 8.81² =
  9. 9.69² =
  10. 10.79² =
  11. 11.31² =
  12. 12.21² =
  13. 13.19² =
  14. 14.79² =
  15. 15.31² =
  16. 16.29² =
  17. 17.79² =
  18. 18.29² =
  19. 19.19² =
  20. 20.19² =
  21. 21.21² =
  22. 22.71² =
  23. 23.59² =
  24. 24.39² =
  25. 25.21² =
  26. 26.61² =
  27. 27.49² =
  28. 28.51² =
  29. 29.91² =
  30. 30.21² =
  31. 31.41² =
  32. 32.21² =
  33. 33.69² =
  34. 34.81² =
  35. 35.89² =
  36. 36.49² =
  37. 37.69² =
  38. 38.49² =
  39. 39.81² =
  40. 40.31² =

Answer key

  1. 841
  2. 2401
  3. 6241
  4. 5041
  5. 2401
  6. 1521
  7. 6241
  8. 6561
  9. 4761
  10. 6241
  11. 961
  12. 441
  13. 361
  14. 6241
  15. 961
  16. 841
  17. 6241
  18. 841
  19. 361
  20. 361
  21. 441
  22. 5041
  23. 3481
  24. 1521
  25. 441
  26. 3721
  27. 2401
  28. 2601
  29. 8281
  30. 441
  31. 1681
  32. 441
  33. 4761
  34. 6561
  35. 7921
  36. 2401
  37. 4761
  38. 2401
  39. 6561
  40. 961

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