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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 62 · 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. 1.89² =
  2. 2.21² =
  3. 3.19² =
  4. 4.81² =
  5. 5.31² =
  6. 6.91² =
  7. 7.71² =
  8. 8.39² =
  9. 9.69² =
  10. 10.41² =
  11. 11.31² =
  12. 12.69² =
  13. 13.31² =
  14. 14.19² =
  15. 15.61² =
  16. 16.41² =
  17. 17.19² =
  18. 18.31² =
  19. 19.31² =
  20. 20.31² =
  21. 21.29² =
  22. 22.19² =
  23. 23.49² =
  24. 24.19² =
  25. 25.71² =
  26. 26.61² =
  27. 27.39² =
  28. 28.41² =
  29. 29.51² =
  30. 30.79² =
  31. 31.81² =
  32. 32.79² =
  33. 33.59² =
  34. 34.39² =
  35. 35.71² =
  36. 36.81² =
  37. 37.59² =
  38. 38.19² =
  39. 39.49² =
  40. 40.49² =

Answer key

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

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