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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 356 · 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. 1.81² =
  2. 2.19² =
  3. 3.21² =
  4. 4.51² =
  5. 5.39² =
  6. 6.19² =
  7. 7.81² =
  8. 8.29² =
  9. 9.71² =
  10. 10.31² =
  11. 11.21² =
  12. 12.39² =
  13. 13.61² =
  14. 14.71² =
  15. 15.21² =
  16. 16.19² =
  17. 17.81² =
  18. 18.81² =
  19. 19.19² =
  20. 20.81² =
  21. 21.59² =
  22. 22.91² =
  23. 23.81² =
  24. 24.89² =
  25. 25.89² =
  26. 26.89² =
  27. 27.49² =
  28. 28.31² =
  29. 29.91² =
  30. 30.29² =
  31. 31.59² =
  32. 32.41² =
  33. 33.91² =
  34. 34.29² =
  35. 35.79² =
  36. 36.69² =
  37. 37.29² =
  38. 38.61² =
  39. 39.79² =
  40. 40.59² =

Answer key

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

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