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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 41 · 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. 2.61² =
  3. 3.79² =
  4. 4.61² =
  5. 5.41² =
  6. 6.71² =
  7. 7.81² =
  8. 8.19² =
  9. 9.79² =
  10. 10.31² =
  11. 11.61² =
  12. 12.21² =
  13. 13.19² =
  14. 14.61² =
  15. 15.19² =
  16. 16.19² =
  17. 17.39² =
  18. 18.31² =
  19. 19.29² =
  20. 20.51² =
  21. 21.59² =
  22. 22.79² =
  23. 23.81² =
  24. 24.79² =
  25. 25.69² =
  26. 26.19² =
  27. 27.89² =
  28. 28.21² =
  29. 29.29² =
  30. 30.49² =
  31. 31.89² =
  32. 32.91² =
  33. 33.21² =
  34. 34.19² =
  35. 35.29² =
  36. 36.91² =
  37. 37.61² =
  38. 38.71² =
  39. 39.19² =
  40. 40.69² =

Answer key

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

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