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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 298 · 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. 2.61² =
  3. 3.41² =
  4. 4.21² =
  5. 5.79² =
  6. 6.81² =
  7. 7.91² =
  8. 8.69² =
  9. 9.91² =
  10. 10.81² =
  11. 11.19² =
  12. 12.49² =
  13. 13.21² =
  14. 14.91² =
  15. 15.79² =
  16. 16.79² =
  17. 17.89² =
  18. 18.41² =
  19. 19.59² =
  20. 20.31² =
  21. 21.31² =
  22. 22.41² =
  23. 23.89² =
  24. 24.39² =
  25. 25.29² =
  26. 26.89² =
  27. 27.79² =
  28. 28.51² =
  29. 29.89² =
  30. 30.31² =
  31. 31.31² =
  32. 32.29² =
  33. 33.59² =
  34. 34.59² =
  35. 35.39² =
  36. 36.49² =
  37. 37.71² =
  38. 38.69² =
  39. 39.81² =
  40. 40.81² =

Answer key

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

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