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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 216 · 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. 1.89² =
  2. 2.21² =
  3. 3.91² =
  4. 4.61² =
  5. 5.71² =
  6. 6.79² =
  7. 7.89² =
  8. 8.31² =
  9. 9.39² =
  10. 10.29² =
  11. 11.59² =
  12. 12.29² =
  13. 13.49² =
  14. 14.91² =
  15. 15.39² =
  16. 16.49² =
  17. 17.29² =
  18. 18.51² =
  19. 19.51² =
  20. 20.59² =
  21. 21.91² =
  22. 22.91² =
  23. 23.29² =
  24. 24.81² =
  25. 25.71² =
  26. 26.19² =
  27. 27.81² =
  28. 28.21² =
  29. 29.61² =
  30. 30.49² =
  31. 31.21² =
  32. 32.19² =
  33. 33.59² =
  34. 34.79² =
  35. 35.31² =
  36. 36.49² =
  37. 37.81² =
  38. 38.71² =
  39. 39.71² =
  40. 40.81² =

Answer key

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

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