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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 82 · 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. 2.89² =
  3. 3.59² =
  4. 4.19² =
  5. 5.29² =
  6. 6.19² =
  7. 7.79² =
  8. 8.89² =
  9. 9.21² =
  10. 10.51² =
  11. 11.29² =
  12. 12.91² =
  13. 13.81² =
  14. 14.81² =
  15. 15.31² =
  16. 16.91² =
  17. 17.71² =
  18. 18.61² =
  19. 19.61² =
  20. 20.19² =
  21. 21.71² =
  22. 22.81² =
  23. 23.39² =
  24. 24.41² =
  25. 25.19² =
  26. 26.21² =
  27. 27.91² =
  28. 28.21² =
  29. 29.79² =
  30. 30.21² =
  31. 31.21² =
  32. 32.61² =
  33. 33.81² =
  34. 34.51² =
  35. 35.69² =
  36. 36.51² =
  37. 37.21² =
  38. 38.71² =
  39. 39.59² =
  40. 40.51² =

Answer key

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

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