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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 496 · 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. 1.89² =
  2. 2.19² =
  3. 3.59² =
  4. 4.91² =
  5. 5.79² =
  6. 6.39² =
  7. 7.49² =
  8. 8.21² =
  9. 9.31² =
  10. 10.39² =
  11. 11.71² =
  12. 12.69² =
  13. 13.21² =
  14. 14.79² =
  15. 15.49² =
  16. 16.91² =
  17. 17.79² =
  18. 18.69² =
  19. 19.69² =
  20. 20.21² =
  21. 21.39² =
  22. 22.59² =
  23. 23.21² =
  24. 24.81² =
  25. 25.91² =
  26. 26.21² =
  27. 27.29² =
  28. 28.51² =
  29. 29.81² =
  30. 30.71² =
  31. 31.51² =
  32. 32.51² =
  33. 33.51² =
  34. 34.41² =
  35. 35.89² =
  36. 36.31² =
  37. 37.69² =
  38. 38.29² =
  39. 39.91² =
  40. 40.79² =

Answer key

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

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