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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 179 · 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. 1.49² =
  2. 2.31² =
  3. 3.29² =
  4. 4.31² =
  5. 5.21² =
  6. 6.49² =
  7. 7.91² =
  8. 8.69² =
  9. 9.49² =
  10. 10.29² =
  11. 11.59² =
  12. 12.19² =
  13. 13.81² =
  14. 14.29² =
  15. 15.79² =
  16. 16.71² =
  17. 17.49² =
  18. 18.39² =
  19. 19.41² =
  20. 20.61² =
  21. 21.91² =
  22. 22.79² =
  23. 23.41² =
  24. 24.61² =
  25. 25.79² =
  26. 26.21² =
  27. 27.31² =
  28. 28.79² =
  29. 29.59² =
  30. 30.81² =
  31. 31.39² =
  32. 32.31² =
  33. 33.51² =
  34. 34.19² =
  35. 35.49² =
  36. 36.31² =
  37. 37.41² =
  38. 38.89² =
  39. 39.19² =
  40. 40.39² =

Answer key

  1. 2401
  2. 961
  3. 841
  4. 961
  5. 441
  6. 2401
  7. 8281
  8. 4761
  9. 2401
  10. 841
  11. 3481
  12. 361
  13. 6561
  14. 841
  15. 6241
  16. 5041
  17. 2401
  18. 1521
  19. 1681
  20. 3721
  21. 8281
  22. 6241
  23. 1681
  24. 3721
  25. 6241
  26. 441
  27. 961
  28. 6241
  29. 3481
  30. 6561
  31. 1521
  32. 961
  33. 2601
  34. 361
  35. 2401
  36. 961
  37. 1681
  38. 7921
  39. 361
  40. 1521

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