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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 652 · 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. 1.31² =
  2. 2.41² =
  3. 3.69² =
  4. 4.19² =
  5. 5.51² =
  6. 6.79² =
  7. 7.49² =
  8. 8.71² =
  9. 9.21² =
  10. 10.61² =
  11. 11.69² =
  12. 12.49² =
  13. 13.39² =
  14. 14.81² =
  15. 15.51² =
  16. 16.31² =
  17. 17.51² =
  18. 18.31² =
  19. 19.81² =
  20. 20.79² =
  21. 21.59² =
  22. 22.31² =
  23. 23.71² =
  24. 24.39² =
  25. 25.81² =
  26. 26.39² =
  27. 27.89² =
  28. 28.51² =
  29. 29.31² =
  30. 30.81² =
  31. 31.69² =
  32. 32.41² =
  33. 33.61² =
  34. 34.91² =
  35. 35.79² =
  36. 36.69² =
  37. 37.29² =
  38. 38.91² =
  39. 39.49² =
  40. 40.21² =

Answer key

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

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