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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 121 · 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. 1.49² =
  2. 2.71² =
  3. 3.41² =
  4. 4.91² =
  5. 5.79² =
  6. 6.31² =
  7. 7.21² =
  8. 8.61² =
  9. 9.19² =
  10. 10.39² =
  11. 11.49² =
  12. 12.49² =
  13. 13.61² =
  14. 14.29² =
  15. 15.29² =
  16. 16.79² =
  17. 17.51² =
  18. 18.71² =
  19. 19.31² =
  20. 20.89² =
  21. 21.51² =
  22. 22.29² =
  23. 23.81² =
  24. 24.79² =
  25. 25.19² =
  26. 26.39² =
  27. 27.69² =
  28. 28.89² =
  29. 29.89² =
  30. 30.21² =
  31. 31.39² =
  32. 32.21² =
  33. 33.41² =
  34. 34.49² =
  35. 35.21² =
  36. 36.29² =
  37. 37.19² =
  38. 38.69² =
  39. 39.61² =
  40. 40.69² =

Answer key

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

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