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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 55 · 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. 1.31² =
  2. 2.51² =
  3. 3.51² =
  4. 4.31² =
  5. 5.89² =
  6. 6.51² =
  7. 7.19² =
  8. 8.19² =
  9. 9.89² =
  10. 10.51² =
  11. 11.69² =
  12. 12.49² =
  13. 13.21² =
  14. 14.71² =
  15. 15.31² =
  16. 16.89² =
  17. 17.79² =
  18. 18.19² =
  19. 19.81² =
  20. 20.19² =
  21. 21.51² =
  22. 22.71² =
  23. 23.29² =
  24. 24.79² =
  25. 25.71² =
  26. 26.21² =
  27. 27.39² =
  28. 28.49² =
  29. 29.69² =
  30. 30.89² =
  31. 31.19² =
  32. 32.51² =
  33. 33.81² =
  34. 34.31² =
  35. 35.91² =
  36. 36.31² =
  37. 37.41² =
  38. 38.29² =
  39. 39.79² =
  40. 40.91² =

Answer key

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

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