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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 466 · 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. 1.71² =
  2. 2.31² =
  3. 3.69² =
  4. 4.79² =
  5. 5.71² =
  6. 6.91² =
  7. 7.19² =
  8. 8.59² =
  9. 9.61² =
  10. 10.49² =
  11. 11.61² =
  12. 12.51² =
  13. 13.61² =
  14. 14.81² =
  15. 15.39² =
  16. 16.89² =
  17. 17.31² =
  18. 18.49² =
  19. 19.49² =
  20. 20.41² =
  21. 21.49² =
  22. 22.21² =
  23. 23.19² =
  24. 24.49² =
  25. 25.21² =
  26. 26.41² =
  27. 27.31² =
  28. 28.69² =
  29. 29.69² =
  30. 30.19² =
  31. 31.19² =
  32. 32.79² =
  33. 33.79² =
  34. 34.79² =
  35. 35.69² =
  36. 36.39² =
  37. 37.41² =
  38. 38.61² =
  39. 39.81² =
  40. 40.31² =

Answer key

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

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