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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 480 · 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. 1.71² =
  2. 2.69² =
  3. 3.89² =
  4. 4.81² =
  5. 5.79² =
  6. 6.21² =
  7. 7.31² =
  8. 8.61² =
  9. 9.69² =
  10. 10.51² =
  11. 11.49² =
  12. 12.39² =
  13. 13.61² =
  14. 14.89² =
  15. 15.41² =
  16. 16.89² =
  17. 17.31² =
  18. 18.81² =
  19. 19.79² =
  20. 20.49² =
  21. 21.69² =
  22. 22.31² =
  23. 23.29² =
  24. 24.21² =
  25. 25.51² =
  26. 26.21² =
  27. 27.39² =
  28. 28.51² =
  29. 29.49² =
  30. 30.59² =
  31. 31.49² =
  32. 32.19² =
  33. 33.79² =
  34. 34.91² =
  35. 35.81² =
  36. 36.79² =
  37. 37.41² =
  38. 38.79² =
  39. 39.91² =
  40. 40.79² =

Answer key

  1. 5041
  2. 4761
  3. 7921
  4. 6561
  5. 6241
  6. 441
  7. 961
  8. 3721
  9. 4761
  10. 2601
  11. 2401
  12. 1521
  13. 3721
  14. 7921
  15. 1681
  16. 7921
  17. 961
  18. 6561
  19. 6241
  20. 2401
  21. 4761
  22. 961
  23. 841
  24. 441
  25. 2601
  26. 441
  27. 1521
  28. 2601
  29. 2401
  30. 3481
  31. 2401
  32. 361
  33. 6241
  34. 8281
  35. 6561
  36. 6241
  37. 1681
  38. 6241
  39. 8281
  40. 6241

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