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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 524 · 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. 3.79² =
  4. 4.41² =
  5. 5.79² =
  6. 6.89² =
  7. 7.29² =
  8. 8.59² =
  9. 9.51² =
  10. 10.91² =
  11. 11.69² =
  12. 12.81² =
  13. 13.91² =
  14. 14.21² =
  15. 15.81² =
  16. 16.79² =
  17. 17.69² =
  18. 18.49² =
  19. 19.61² =
  20. 20.41² =
  21. 21.69² =
  22. 22.39² =
  23. 23.91² =
  24. 24.81² =
  25. 25.31² =
  26. 26.29² =
  27. 27.31² =
  28. 28.31² =
  29. 29.19² =
  30. 30.19² =
  31. 31.51² =
  32. 32.29² =
  33. 33.49² =
  34. 34.71² =
  35. 35.31² =
  36. 36.41² =
  37. 37.71² =
  38. 38.71² =
  39. 39.81² =
  40. 40.51² =

Answer key

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

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