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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 254 · 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. 2.89² =
  3. 3.81² =
  4. 4.21² =
  5. 5.31² =
  6. 6.31² =
  7. 7.61² =
  8. 8.49² =
  9. 9.79² =
  10. 10.19² =
  11. 11.19² =
  12. 12.59² =
  13. 13.79² =
  14. 14.69² =
  15. 15.41² =
  16. 16.59² =
  17. 17.41² =
  18. 18.39² =
  19. 19.19² =
  20. 20.19² =
  21. 21.49² =
  22. 22.61² =
  23. 23.59² =
  24. 24.31² =
  25. 25.39² =
  26. 26.29² =
  27. 27.59² =
  28. 28.91² =
  29. 29.41² =
  30. 30.91² =
  31. 31.81² =
  32. 32.69² =
  33. 33.41² =
  34. 34.51² =
  35. 35.39² =
  36. 36.39² =
  37. 37.19² =
  38. 38.91² =
  39. 39.91² =
  40. 40.21² =

Answer key

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

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