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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 484 · 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. 2.69² =
  3. 3.31² =
  4. 4.69² =
  5. 5.81² =
  6. 6.41² =
  7. 7.21² =
  8. 8.29² =
  9. 9.29² =
  10. 10.41² =
  11. 11.19² =
  12. 12.69² =
  13. 13.19² =
  14. 14.89² =
  15. 15.41² =
  16. 16.69² =
  17. 17.61² =
  18. 18.19² =
  19. 19.71² =
  20. 20.39² =
  21. 21.19² =
  22. 22.49² =
  23. 23.29² =
  24. 24.19² =
  25. 25.89² =
  26. 26.71² =
  27. 27.71² =
  28. 28.19² =
  29. 29.81² =
  30. 30.61² =
  31. 31.49² =
  32. 32.51² =
  33. 33.71² =
  34. 34.49² =
  35. 35.19² =
  36. 36.69² =
  37. 37.31² =
  38. 38.41² =
  39. 39.51² =
  40. 40.79² =

Answer key

  1. 841
  2. 4761
  3. 961
  4. 4761
  5. 6561
  6. 1681
  7. 441
  8. 841
  9. 841
  10. 1681
  11. 361
  12. 4761
  13. 361
  14. 7921
  15. 1681
  16. 4761
  17. 3721
  18. 361
  19. 5041
  20. 1521
  21. 361
  22. 2401
  23. 841
  24. 361
  25. 7921
  26. 5041
  27. 5041
  28. 361
  29. 6561
  30. 3721
  31. 2401
  32. 2601
  33. 5041
  34. 2401
  35. 361
  36. 4761
  37. 961
  38. 1681
  39. 2601
  40. 6241

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