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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 260 · 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. 1.81² =
  2. 2.31² =
  3. 3.29² =
  4. 4.91² =
  5. 5.79² =
  6. 6.91² =
  7. 7.81² =
  8. 8.79² =
  9. 9.61² =
  10. 10.69² =
  11. 11.61² =
  12. 12.21² =
  13. 13.51² =
  14. 14.49² =
  15. 15.39² =
  16. 16.39² =
  17. 17.61² =
  18. 18.29² =
  19. 19.59² =
  20. 20.29² =
  21. 21.91² =
  22. 22.49² =
  23. 23.59² =
  24. 24.39² =
  25. 25.21² =
  26. 26.21² =
  27. 27.31² =
  28. 28.39² =
  29. 29.79² =
  30. 30.59² =
  31. 31.19² =
  32. 32.71² =
  33. 33.79² =
  34. 34.39² =
  35. 35.39² =
  36. 36.31² =
  37. 37.71² =
  38. 38.89² =
  39. 39.29² =
  40. 40.49² =

Answer key

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

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