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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 114 · 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. 1.49² =
  2. 2.69² =
  3. 3.81² =
  4. 4.61² =
  5. 5.21² =
  6. 6.49² =
  7. 7.41² =
  8. 8.31² =
  9. 9.41² =
  10. 10.81² =
  11. 11.21² =
  12. 12.21² =
  13. 13.71² =
  14. 14.79² =
  15. 15.89² =
  16. 16.69² =
  17. 17.31² =
  18. 18.79² =
  19. 19.49² =
  20. 20.31² =
  21. 21.19² =
  22. 22.31² =
  23. 23.61² =
  24. 24.29² =
  25. 25.21² =
  26. 26.51² =
  27. 27.29² =
  28. 28.61² =
  29. 29.21² =
  30. 30.61² =
  31. 31.71² =
  32. 32.91² =
  33. 33.29² =
  34. 34.69² =
  35. 35.61² =
  36. 36.49² =
  37. 37.31² =
  38. 38.51² =
  39. 39.51² =
  40. 40.61² =

Answer key

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

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