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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 279 · 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. 1.41² =
  2. 2.79² =
  3. 3.59² =
  4. 4.59² =
  5. 5.31² =
  6. 6.29² =
  7. 7.19² =
  8. 8.81² =
  9. 9.21² =
  10. 10.19² =
  11. 11.31² =
  12. 12.21² =
  13. 13.59² =
  14. 14.79² =
  15. 15.59² =
  16. 16.19² =
  17. 17.21² =
  18. 18.39² =
  19. 19.31² =
  20. 20.89² =
  21. 21.21² =
  22. 22.31² =
  23. 23.49² =
  24. 24.91² =
  25. 25.59² =
  26. 26.21² =
  27. 27.49² =
  28. 28.31² =
  29. 29.29² =
  30. 30.31² =
  31. 31.91² =
  32. 32.49² =
  33. 33.41² =
  34. 34.31² =
  35. 35.51² =
  36. 36.71² =
  37. 37.21² =
  38. 38.49² =
  39. 39.49² =
  40. 40.59² =

Answer key

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

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