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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 334 · 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. 1.21² =
  2. 2.41² =
  3. 3.39² =
  4. 4.59² =
  5. 5.69² =
  6. 6.19² =
  7. 7.71² =
  8. 8.19² =
  9. 9.51² =
  10. 10.61² =
  11. 11.61² =
  12. 12.51² =
  13. 13.41² =
  14. 14.39² =
  15. 15.91² =
  16. 16.71² =
  17. 17.89² =
  18. 18.19² =
  19. 19.49² =
  20. 20.49² =
  21. 21.79² =
  22. 22.29² =
  23. 23.29² =
  24. 24.29² =
  25. 25.19² =
  26. 26.31² =
  27. 27.31² =
  28. 28.41² =
  29. 29.69² =
  30. 30.41² =
  31. 31.21² =
  32. 32.51² =
  33. 33.21² =
  34. 34.59² =
  35. 35.81² =
  36. 36.51² =
  37. 37.69² =
  38. 38.59² =
  39. 39.79² =
  40. 40.19² =

Answer key

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

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