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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 461 · 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. 1.59² =
  2. 2.29² =
  3. 3.19² =
  4. 4.39² =
  5. 5.41² =
  6. 6.31² =
  7. 7.41² =
  8. 8.29² =
  9. 9.21² =
  10. 10.19² =
  11. 11.79² =
  12. 12.31² =
  13. 13.79² =
  14. 14.61² =
  15. 15.29² =
  16. 16.59² =
  17. 17.81² =
  18. 18.69² =
  19. 19.39² =
  20. 20.19² =
  21. 21.81² =
  22. 22.91² =
  23. 23.61² =
  24. 24.91² =
  25. 25.41² =
  26. 26.51² =
  27. 27.51² =
  28. 28.89² =
  29. 29.79² =
  30. 30.31² =
  31. 31.89² =
  32. 32.51² =
  33. 33.71² =
  34. 34.79² =
  35. 35.39² =
  36. 36.71² =
  37. 37.61² =
  38. 38.59² =
  39. 39.61² =
  40. 40.81² =

Answer key

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

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