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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 406 · 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. 1.41² =
  2. 2.31² =
  3. 3.49² =
  4. 4.89² =
  5. 5.49² =
  6. 6.49² =
  7. 7.19² =
  8. 8.89² =
  9. 9.21² =
  10. 10.51² =
  11. 11.21² =
  12. 12.21² =
  13. 13.39² =
  14. 14.39² =
  15. 15.49² =
  16. 16.61² =
  17. 17.59² =
  18. 18.79² =
  19. 19.49² =
  20. 20.91² =
  21. 21.31² =
  22. 22.59² =
  23. 23.61² =
  24. 24.69² =
  25. 25.71² =
  26. 26.41² =
  27. 27.81² =
  28. 28.19² =
  29. 29.31² =
  30. 30.29² =
  31. 31.89² =
  32. 32.49² =
  33. 33.59² =
  34. 34.59² =
  35. 35.39² =
  36. 36.81² =
  37. 37.79² =
  38. 38.79² =
  39. 39.59² =
  40. 40.81² =

Answer key

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

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