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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 552 · 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. 2.39² =
  3. 3.81² =
  4. 4.91² =
  5. 5.91² =
  6. 6.31² =
  7. 7.41² =
  8. 8.89² =
  9. 9.81² =
  10. 10.49² =
  11. 11.61² =
  12. 12.51² =
  13. 13.61² =
  14. 14.21² =
  15. 15.59² =
  16. 16.59² =
  17. 17.81² =
  18. 18.79² =
  19. 19.51² =
  20. 20.81² =
  21. 21.51² =
  22. 22.41² =
  23. 23.29² =
  24. 24.49² =
  25. 25.81² =
  26. 26.39² =
  27. 27.89² =
  28. 28.29² =
  29. 29.61² =
  30. 30.21² =
  31. 31.29² =
  32. 32.19² =
  33. 33.79² =
  34. 34.81² =
  35. 35.89² =
  36. 36.71² =
  37. 37.71² =
  38. 38.31² =
  39. 39.81² =
  40. 40.19² =

Answer key

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

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