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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 369 · 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. 1.21² =
  2. 2.61² =
  3. 3.51² =
  4. 4.69² =
  5. 5.41² =
  6. 6.49² =
  7. 7.19² =
  8. 8.31² =
  9. 9.61² =
  10. 10.31² =
  11. 11.29² =
  12. 12.79² =
  13. 13.21² =
  14. 14.31² =
  15. 15.19² =
  16. 16.31² =
  17. 17.81² =
  18. 18.79² =
  19. 19.91² =
  20. 20.89² =
  21. 21.49² =
  22. 22.51² =
  23. 23.19² =
  24. 24.69² =
  25. 25.21² =
  26. 26.61² =
  27. 27.29² =
  28. 28.79² =
  29. 29.31² =
  30. 30.19² =
  31. 31.79² =
  32. 32.89² =
  33. 33.71² =
  34. 34.41² =
  35. 35.21² =
  36. 36.39² =
  37. 37.19² =
  38. 38.69² =
  39. 39.69² =
  40. 40.31² =

Answer key

  1. 441
  2. 3721
  3. 2601
  4. 4761
  5. 1681
  6. 2401
  7. 361
  8. 961
  9. 3721
  10. 961
  11. 841
  12. 6241
  13. 441
  14. 961
  15. 361
  16. 961
  17. 6561
  18. 6241
  19. 8281
  20. 7921
  21. 2401
  22. 2601
  23. 361
  24. 4761
  25. 441
  26. 3721
  27. 841
  28. 6241
  29. 961
  30. 361
  31. 6241
  32. 7921
  33. 5041
  34. 1681
  35. 441
  36. 1521
  37. 361
  38. 4761
  39. 4761
  40. 961

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