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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 759 · 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. 2.69² =
  3. 3.91² =
  4. 4.41² =
  5. 5.91² =
  6. 6.49² =
  7. 7.21² =
  8. 8.79² =
  9. 9.59² =
  10. 10.31² =
  11. 11.69² =
  12. 12.31² =
  13. 13.19² =
  14. 14.51² =
  15. 15.69² =
  16. 16.21² =
  17. 17.59² =
  18. 18.21² =
  19. 19.39² =
  20. 20.21² =
  21. 21.41² =
  22. 22.81² =
  23. 23.39² =
  24. 24.21² =
  25. 25.81² =
  26. 26.89² =
  27. 27.91² =
  28. 28.19² =
  29. 29.21² =
  30. 30.41² =
  31. 31.59² =
  32. 32.39² =
  33. 33.71² =
  34. 34.81² =
  35. 35.29² =
  36. 36.59² =
  37. 37.79² =
  38. 38.91² =
  39. 39.91² =
  40. 40.21² =

Answer key

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

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