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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 256 · 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. 1.39² =
  2. 2.39² =
  3. 3.81² =
  4. 4.71² =
  5. 5.19² =
  6. 6.79² =
  7. 7.41² =
  8. 8.81² =
  9. 9.49² =
  10. 10.21² =
  11. 11.61² =
  12. 12.39² =
  13. 13.19² =
  14. 14.41² =
  15. 15.81² =
  16. 16.59² =
  17. 17.19² =
  18. 18.31² =
  19. 19.39² =
  20. 20.49² =
  21. 21.81² =
  22. 22.81² =
  23. 23.79² =
  24. 24.41² =
  25. 25.19² =
  26. 26.71² =
  27. 27.49² =
  28. 28.81² =
  29. 29.61² =
  30. 30.89² =
  31. 31.49² =
  32. 32.29² =
  33. 33.51² =
  34. 34.79² =
  35. 35.81² =
  36. 36.89² =
  37. 37.91² =
  38. 38.29² =
  39. 39.39² =
  40. 40.51² =

Answer key

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

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