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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 135 · 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. 1.71² =
  2. 2.71² =
  3. 3.89² =
  4. 4.21² =
  5. 5.81² =
  6. 6.21² =
  7. 7.41² =
  8. 8.31² =
  9. 9.79² =
  10. 10.51² =
  11. 11.39² =
  12. 12.79² =
  13. 13.21² =
  14. 14.61² =
  15. 15.39² =
  16. 16.79² =
  17. 17.81² =
  18. 18.91² =
  19. 19.19² =
  20. 20.39² =
  21. 21.49² =
  22. 22.51² =
  23. 23.41² =
  24. 24.49² =
  25. 25.79² =
  26. 26.29² =
  27. 27.81² =
  28. 28.19² =
  29. 29.49² =
  30. 30.39² =
  31. 31.59² =
  32. 32.79² =
  33. 33.91² =
  34. 34.59² =
  35. 35.81² =
  36. 36.19² =
  37. 37.51² =
  38. 38.91² =
  39. 39.61² =
  40. 40.61² =

Answer key

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

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