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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 612 · 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. 1.49² =
  2. 2.79² =
  3. 3.89² =
  4. 4.51² =
  5. 5.29² =
  6. 6.49² =
  7. 7.79² =
  8. 8.51² =
  9. 9.31² =
  10. 10.49² =
  11. 11.91² =
  12. 12.79² =
  13. 13.19² =
  14. 14.79² =
  15. 15.71² =
  16. 16.69² =
  17. 17.29² =
  18. 18.29² =
  19. 19.59² =
  20. 20.59² =
  21. 21.31² =
  22. 22.31² =
  23. 23.69² =
  24. 24.41² =
  25. 25.51² =
  26. 26.81² =
  27. 27.39² =
  28. 28.71² =
  29. 29.41² =
  30. 30.79² =
  31. 31.51² =
  32. 32.49² =
  33. 33.41² =
  34. 34.29² =
  35. 35.31² =
  36. 36.91² =
  37. 37.29² =
  38. 38.41² =
  39. 39.79² =
  40. 40.19² =

Answer key

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

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