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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 211 · 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. 2.91² =
  3. 3.29² =
  4. 4.29² =
  5. 5.39² =
  6. 6.41² =
  7. 7.81² =
  8. 8.91² =
  9. 9.79² =
  10. 10.39² =
  11. 11.41² =
  12. 12.91² =
  13. 13.79² =
  14. 14.31² =
  15. 15.89² =
  16. 16.59² =
  17. 17.61² =
  18. 18.89² =
  19. 19.31² =
  20. 20.69² =
  21. 21.21² =
  22. 22.49² =
  23. 23.29² =
  24. 24.19² =
  25. 25.51² =
  26. 26.41² =
  27. 27.59² =
  28. 28.31² =
  29. 29.61² =
  30. 30.89² =
  31. 31.29² =
  32. 32.91² =
  33. 33.89² =
  34. 34.81² =
  35. 35.41² =
  36. 36.91² =
  37. 37.71² =
  38. 38.29² =
  39. 39.19² =
  40. 40.51² =

Answer key

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

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