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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 381 · 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. 1.91² =
  2. 2.71² =
  3. 3.21² =
  4. 4.19² =
  5. 5.39² =
  6. 6.19² =
  7. 7.91² =
  8. 8.41² =
  9. 9.21² =
  10. 10.39² =
  11. 11.51² =
  12. 12.79² =
  13. 13.19² =
  14. 14.39² =
  15. 15.19² =
  16. 16.19² =
  17. 17.19² =
  18. 18.19² =
  19. 19.71² =
  20. 20.29² =
  21. 21.19² =
  22. 22.41² =
  23. 23.79² =
  24. 24.21² =
  25. 25.49² =
  26. 26.89² =
  27. 27.19² =
  28. 28.81² =
  29. 29.41² =
  30. 30.59² =
  31. 31.89² =
  32. 32.31² =
  33. 33.69² =
  34. 34.31² =
  35. 35.29² =
  36. 36.41² =
  37. 37.61² =
  38. 38.79² =
  39. 39.29² =
  40. 40.39² =

Answer key

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

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