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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 808 · 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. 1.41² =
  2. 2.19² =
  3. 3.91² =
  4. 4.79² =
  5. 5.39² =
  6. 6.49² =
  7. 7.79² =
  8. 8.61² =
  9. 9.21² =
  10. 10.69² =
  11. 11.19² =
  12. 12.69² =
  13. 13.71² =
  14. 14.61² =
  15. 15.79² =
  16. 16.61² =
  17. 17.19² =
  18. 18.79² =
  19. 19.31² =
  20. 20.69² =
  21. 21.19² =
  22. 22.51² =
  23. 23.49² =
  24. 24.49² =
  25. 25.81² =
  26. 26.19² =
  27. 27.19² =
  28. 28.19² =
  29. 29.91² =
  30. 30.91² =
  31. 31.49² =
  32. 32.81² =
  33. 33.61² =
  34. 34.81² =
  35. 35.71² =
  36. 36.41² =
  37. 37.71² =
  38. 38.21² =
  39. 39.49² =
  40. 40.31² =

Answer key

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

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