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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 207 · 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. 2.31² =
  3. 3.79² =
  4. 4.79² =
  5. 5.49² =
  6. 6.19² =
  7. 7.19² =
  8. 8.69² =
  9. 9.39² =
  10. 10.39² =
  11. 11.91² =
  12. 12.29² =
  13. 13.39² =
  14. 14.19² =
  15. 15.59² =
  16. 16.21² =
  17. 17.89² =
  18. 18.79² =
  19. 19.19² =
  20. 20.89² =
  21. 21.49² =
  22. 22.61² =
  23. 23.49² =
  24. 24.29² =
  25. 25.61² =
  26. 26.31² =
  27. 27.29² =
  28. 28.81² =
  29. 29.91² =
  30. 30.69² =
  31. 31.39² =
  32. 32.39² =
  33. 33.39² =
  34. 34.21² =
  35. 35.41² =
  36. 36.29² =
  37. 37.29² =
  38. 38.89² =
  39. 39.79² =
  40. 40.51² =

Answer key

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

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