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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 332 · 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. 1.79² =
  2. 2.41² =
  3. 3.41² =
  4. 4.61² =
  5. 5.79² =
  6. 6.59² =
  7. 7.29² =
  8. 8.79² =
  9. 9.39² =
  10. 10.21² =
  11. 11.51² =
  12. 12.41² =
  13. 13.51² =
  14. 14.51² =
  15. 15.21² =
  16. 16.49² =
  17. 17.61² =
  18. 18.31² =
  19. 19.81² =
  20. 20.21² =
  21. 21.39² =
  22. 22.79² =
  23. 23.59² =
  24. 24.49² =
  25. 25.39² =
  26. 26.79² =
  27. 27.81² =
  28. 28.71² =
  29. 29.81² =
  30. 30.49² =
  31. 31.29² =
  32. 32.29² =
  33. 33.41² =
  34. 34.21² =
  35. 35.49² =
  36. 36.41² =
  37. 37.39² =
  38. 38.89² =
  39. 39.31² =
  40. 40.19² =

Answer key

  1. 6241
  2. 1681
  3. 1681
  4. 3721
  5. 6241
  6. 3481
  7. 841
  8. 6241
  9. 1521
  10. 441
  11. 2601
  12. 1681
  13. 2601
  14. 2601
  15. 441
  16. 2401
  17. 3721
  18. 961
  19. 6561
  20. 441
  21. 1521
  22. 6241
  23. 3481
  24. 2401
  25. 1521
  26. 6241
  27. 6561
  28. 5041
  29. 6561
  30. 2401
  31. 841
  32. 841
  33. 1681
  34. 441
  35. 2401
  36. 1681
  37. 1521
  38. 7921
  39. 961
  40. 361

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