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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 189 · 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. 3.21² =
  4. 4.31² =
  5. 5.19² =
  6. 6.61² =
  7. 7.91² =
  8. 8.61² =
  9. 9.49² =
  10. 10.59² =
  11. 11.79² =
  12. 12.91² =
  13. 13.19² =
  14. 14.39² =
  15. 15.51² =
  16. 16.69² =
  17. 17.69² =
  18. 18.69² =
  19. 19.89² =
  20. 20.71² =
  21. 21.89² =
  22. 22.31² =
  23. 23.39² =
  24. 24.81² =
  25. 25.61² =
  26. 26.21² =
  27. 27.41² =
  28. 28.89² =
  29. 29.71² =
  30. 30.31² =
  31. 31.41² =
  32. 32.51² =
  33. 33.69² =
  34. 34.91² =
  35. 35.31² =
  36. 36.21² =
  37. 37.31² =
  38. 38.29² =
  39. 39.79² =
  40. 40.41² =

Answer key

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

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