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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 190 · 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. 2.41² =
  3. 3.79² =
  4. 4.81² =
  5. 5.51² =
  6. 6.51² =
  7. 7.51² =
  8. 8.91² =
  9. 9.21² =
  10. 10.49² =
  11. 11.81² =
  12. 12.21² =
  13. 13.89² =
  14. 14.19² =
  15. 15.51² =
  16. 16.81² =
  17. 17.91² =
  18. 18.71² =
  19. 19.21² =
  20. 20.51² =
  21. 21.29² =
  22. 22.61² =
  23. 23.19² =
  24. 24.81² =
  25. 25.31² =
  26. 26.79² =
  27. 27.41² =
  28. 28.41² =
  29. 29.39² =
  30. 30.49² =
  31. 31.61² =
  32. 32.19² =
  33. 33.51² =
  34. 34.59² =
  35. 35.89² =
  36. 36.61² =
  37. 37.61² =
  38. 38.29² =
  39. 39.29² =
  40. 40.71² =

Answer key

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

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