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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 388 · 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. 1.19² =
  2. 2.39² =
  3. 3.91² =
  4. 4.59² =
  5. 5.59² =
  6. 6.51² =
  7. 7.39² =
  8. 8.41² =
  9. 9.81² =
  10. 10.79² =
  11. 11.31² =
  12. 12.19² =
  13. 13.89² =
  14. 14.61² =
  15. 15.81² =
  16. 16.49² =
  17. 17.49² =
  18. 18.21² =
  19. 19.79² =
  20. 20.71² =
  21. 21.89² =
  22. 22.41² =
  23. 23.81² =
  24. 24.69² =
  25. 25.19² =
  26. 26.29² =
  27. 27.71² =
  28. 28.19² =
  29. 29.89² =
  30. 30.89² =
  31. 31.19² =
  32. 32.81² =
  33. 33.21² =
  34. 34.89² =
  35. 35.71² =
  36. 36.81² =
  37. 37.41² =
  38. 38.21² =
  39. 39.21² =
  40. 40.31² =

Answer key

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

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