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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 661 · 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. 1.39² =
  2. 2.81² =
  3. 3.69² =
  4. 4.79² =
  5. 5.21² =
  6. 6.81² =
  7. 7.81² =
  8. 8.31² =
  9. 9.19² =
  10. 10.79² =
  11. 11.31² =
  12. 12.39² =
  13. 13.31² =
  14. 14.71² =
  15. 15.59² =
  16. 16.59² =
  17. 17.81² =
  18. 18.59² =
  19. 19.31² =
  20. 20.69² =
  21. 21.79² =
  22. 22.31² =
  23. 23.41² =
  24. 24.79² =
  25. 25.59² =
  26. 26.39² =
  27. 27.79² =
  28. 28.51² =
  29. 29.21² =
  30. 30.41² =
  31. 31.81² =
  32. 32.41² =
  33. 33.79² =
  34. 34.89² =
  35. 35.61² =
  36. 36.49² =
  37. 37.39² =
  38. 38.89² =
  39. 39.51² =
  40. 40.91² =

Answer key

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

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