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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 379 · 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. 1.69² =
  2. 2.21² =
  3. 3.79² =
  4. 4.19² =
  5. 5.51² =
  6. 6.89² =
  7. 7.21² =
  8. 8.31² =
  9. 9.89² =
  10. 10.69² =
  11. 11.79² =
  12. 12.39² =
  13. 13.19² =
  14. 14.89² =
  15. 15.91² =
  16. 16.29² =
  17. 17.89² =
  18. 18.81² =
  19. 19.79² =
  20. 20.29² =
  21. 21.81² =
  22. 22.31² =
  23. 23.19² =
  24. 24.59² =
  25. 25.31² =
  26. 26.39² =
  27. 27.79² =
  28. 28.89² =
  29. 29.69² =
  30. 30.91² =
  31. 31.79² =
  32. 32.19² =
  33. 33.29² =
  34. 34.69² =
  35. 35.69² =
  36. 36.19² =
  37. 37.91² =
  38. 38.61² =
  39. 39.21² =
  40. 40.29² =

Answer key

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

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