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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 291 · 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. 1.51² =
  2. 2.29² =
  3. 3.21² =
  4. 4.51² =
  5. 5.51² =
  6. 6.31² =
  7. 7.51² =
  8. 8.81² =
  9. 9.19² =
  10. 10.79² =
  11. 11.19² =
  12. 12.39² =
  13. 13.31² =
  14. 14.71² =
  15. 15.49² =
  16. 16.69² =
  17. 17.71² =
  18. 18.19² =
  19. 19.89² =
  20. 20.91² =
  21. 21.69² =
  22. 22.21² =
  23. 23.31² =
  24. 24.29² =
  25. 25.19² =
  26. 26.49² =
  27. 27.69² =
  28. 28.41² =
  29. 29.79² =
  30. 30.81² =
  31. 31.49² =
  32. 32.31² =
  33. 33.49² =
  34. 34.89² =
  35. 35.31² =
  36. 36.49² =
  37. 37.21² =
  38. 38.49² =
  39. 39.59² =
  40. 40.29² =

Answer key

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

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