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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 362 · 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. 1.29² =
  2. 2.29² =
  3. 3.49² =
  4. 4.51² =
  5. 5.91² =
  6. 6.69² =
  7. 7.29² =
  8. 8.49² =
  9. 9.51² =
  10. 10.59² =
  11. 11.89² =
  12. 12.91² =
  13. 13.39² =
  14. 14.61² =
  15. 15.41² =
  16. 16.39² =
  17. 17.31² =
  18. 18.21² =
  19. 19.79² =
  20. 20.19² =
  21. 21.89² =
  22. 22.71² =
  23. 23.81² =
  24. 24.31² =
  25. 25.71² =
  26. 26.49² =
  27. 27.69² =
  28. 28.89² =
  29. 29.19² =
  30. 30.79² =
  31. 31.19² =
  32. 32.89² =
  33. 33.31² =
  34. 34.39² =
  35. 35.19² =
  36. 36.31² =
  37. 37.69² =
  38. 38.69² =
  39. 39.69² =
  40. 40.31² =

Answer key

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

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