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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 792 · 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. 1.29² =
  2. 2.79² =
  3. 3.71² =
  4. 4.41² =
  5. 5.29² =
  6. 6.89² =
  7. 7.29² =
  8. 8.81² =
  9. 9.21² =
  10. 10.39² =
  11. 11.69² =
  12. 12.81² =
  13. 13.71² =
  14. 14.19² =
  15. 15.29² =
  16. 16.79² =
  17. 17.19² =
  18. 18.61² =
  19. 19.19² =
  20. 20.59² =
  21. 21.19² =
  22. 22.31² =
  23. 23.59² =
  24. 24.91² =
  25. 25.81² =
  26. 26.59² =
  27. 27.31² =
  28. 28.29² =
  29. 29.71² =
  30. 30.79² =
  31. 31.51² =
  32. 32.79² =
  33. 33.81² =
  34. 34.41² =
  35. 35.21² =
  36. 36.79² =
  37. 37.89² =
  38. 38.31² =
  39. 39.49² =
  40. 40.69² =

Answer key

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

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