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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 430 · 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. 2.19² =
  3. 3.49² =
  4. 4.19² =
  5. 5.79² =
  6. 6.39² =
  7. 7.19² =
  8. 8.91² =
  9. 9.21² =
  10. 10.49² =
  11. 11.39² =
  12. 12.21² =
  13. 13.49² =
  14. 14.59² =
  15. 15.39² =
  16. 16.49² =
  17. 17.41² =
  18. 18.69² =
  19. 19.31² =
  20. 20.51² =
  21. 21.91² =
  22. 22.41² =
  23. 23.61² =
  24. 24.79² =
  25. 25.59² =
  26. 26.49² =
  27. 27.89² =
  28. 28.31² =
  29. 29.81² =
  30. 30.19² =
  31. 31.89² =
  32. 32.89² =
  33. 33.59² =
  34. 34.79² =
  35. 35.89² =
  36. 36.61² =
  37. 37.39² =
  38. 38.51² =
  39. 39.61² =
  40. 40.91² =

Answer key

  1. 841
  2. 361
  3. 2401
  4. 361
  5. 6241
  6. 1521
  7. 361
  8. 8281
  9. 441
  10. 2401
  11. 1521
  12. 441
  13. 2401
  14. 3481
  15. 1521
  16. 2401
  17. 1681
  18. 4761
  19. 961
  20. 2601
  21. 8281
  22. 1681
  23. 3721
  24. 6241
  25. 3481
  26. 2401
  27. 7921
  28. 961
  29. 6561
  30. 361
  31. 7921
  32. 7921
  33. 3481
  34. 6241
  35. 7921
  36. 3721
  37. 1521
  38. 2601
  39. 3721
  40. 8281

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