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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 44 · 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. 2.41² =
  3. 3.29² =
  4. 4.21² =
  5. 5.39² =
  6. 6.79² =
  7. 7.19² =
  8. 8.39² =
  9. 9.49² =
  10. 10.91² =
  11. 11.69² =
  12. 12.59² =
  13. 13.31² =
  14. 14.59² =
  15. 15.79² =
  16. 16.79² =
  17. 17.51² =
  18. 18.49² =
  19. 19.69² =
  20. 20.39² =
  21. 21.81² =
  22. 22.49² =
  23. 23.59² =
  24. 24.19² =
  25. 25.71² =
  26. 26.51² =
  27. 27.39² =
  28. 28.19² =
  29. 29.79² =
  30. 30.71² =
  31. 31.81² =
  32. 32.31² =
  33. 33.51² =
  34. 34.91² =
  35. 35.69² =
  36. 36.91² =
  37. 37.19² =
  38. 38.21² =
  39. 39.21² =
  40. 40.69² =

Answer key

  1. 361
  2. 1681
  3. 841
  4. 441
  5. 1521
  6. 6241
  7. 361
  8. 1521
  9. 2401
  10. 8281
  11. 4761
  12. 3481
  13. 961
  14. 3481
  15. 6241
  16. 6241
  17. 2601
  18. 2401
  19. 4761
  20. 1521
  21. 6561
  22. 2401
  23. 3481
  24. 361
  25. 5041
  26. 2601
  27. 1521
  28. 361
  29. 6241
  30. 5041
  31. 6561
  32. 961
  33. 2601
  34. 8281
  35. 4761
  36. 8281
  37. 361
  38. 441
  39. 441
  40. 4761

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