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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 176 · 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. 1.79² =
  2. 2.81² =
  3. 3.91² =
  4. 4.61² =
  5. 5.59² =
  6. 6.91² =
  7. 7.91² =
  8. 8.29² =
  9. 9.19² =
  10. 10.29² =
  11. 11.21² =
  12. 12.81² =
  13. 13.61² =
  14. 14.89² =
  15. 15.31² =
  16. 16.69² =
  17. 17.29² =
  18. 18.79² =
  19. 19.89² =
  20. 20.49² =
  21. 21.59² =
  22. 22.89² =
  23. 23.29² =
  24. 24.61² =
  25. 25.41² =
  26. 26.29² =
  27. 27.29² =
  28. 28.39² =
  29. 29.31² =
  30. 30.49² =
  31. 31.31² =
  32. 32.21² =
  33. 33.21² =
  34. 34.29² =
  35. 35.29² =
  36. 36.69² =
  37. 37.19² =
  38. 38.69² =
  39. 39.19² =
  40. 40.51² =

Answer key

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

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