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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 42 · 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. 1.19² =
  2. 2.59² =
  3. 3.31² =
  4. 4.79² =
  5. 5.89² =
  6. 6.59² =
  7. 7.91² =
  8. 8.61² =
  9. 9.61² =
  10. 10.79² =
  11. 11.71² =
  12. 12.69² =
  13. 13.91² =
  14. 14.41² =
  15. 15.19² =
  16. 16.41² =
  17. 17.21² =
  18. 18.29² =
  19. 19.81² =
  20. 20.31² =
  21. 21.51² =
  22. 22.31² =
  23. 23.19² =
  24. 24.81² =
  25. 25.21² =
  26. 26.29² =
  27. 27.51² =
  28. 28.49² =
  29. 29.21² =
  30. 30.79² =
  31. 31.19² =
  32. 32.69² =
  33. 33.21² =
  34. 34.21² =
  35. 35.29² =
  36. 36.79² =
  37. 37.79² =
  38. 38.51² =
  39. 39.59² =
  40. 40.19² =

Answer key

  1. 361
  2. 3481
  3. 961
  4. 6241
  5. 7921
  6. 3481
  7. 8281
  8. 3721
  9. 3721
  10. 6241
  11. 5041
  12. 4761
  13. 8281
  14. 1681
  15. 361
  16. 1681
  17. 441
  18. 841
  19. 6561
  20. 961
  21. 2601
  22. 961
  23. 361
  24. 6561
  25. 441
  26. 841
  27. 2601
  28. 2401
  29. 441
  30. 6241
  31. 361
  32. 4761
  33. 441
  34. 441
  35. 841
  36. 6241
  37. 6241
  38. 2601
  39. 3481
  40. 361

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