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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 373 · 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. 1.91² =
  2. 2.79² =
  3. 3.79² =
  4. 4.51² =
  5. 5.49² =
  6. 6.41² =
  7. 7.89² =
  8. 8.31² =
  9. 9.19² =
  10. 10.19² =
  11. 11.59² =
  12. 12.41² =
  13. 13.71² =
  14. 14.51² =
  15. 15.59² =
  16. 16.49² =
  17. 17.41² =
  18. 18.89² =
  19. 19.29² =
  20. 20.69² =
  21. 21.61² =
  22. 22.19² =
  23. 23.61² =
  24. 24.69² =
  25. 25.59² =
  26. 26.61² =
  27. 27.19² =
  28. 28.41² =
  29. 29.89² =
  30. 30.21² =
  31. 31.71² =
  32. 32.29² =
  33. 33.81² =
  34. 34.39² =
  35. 35.41² =
  36. 36.71² =
  37. 37.29² =
  38. 38.71² =
  39. 39.31² =
  40. 40.51² =

Answer key

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

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