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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 437 · 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. 2.81² =
  3. 3.71² =
  4. 4.79² =
  5. 5.31² =
  6. 6.61² =
  7. 7.39² =
  8. 8.49² =
  9. 9.21² =
  10. 10.69² =
  11. 11.49² =
  12. 12.19² =
  13. 13.49² =
  14. 14.69² =
  15. 15.31² =
  16. 16.61² =
  17. 17.69² =
  18. 18.41² =
  19. 19.61² =
  20. 20.51² =
  21. 21.19² =
  22. 22.39² =
  23. 23.21² =
  24. 24.81² =
  25. 25.69² =
  26. 26.51² =
  27. 27.29² =
  28. 28.89² =
  29. 29.51² =
  30. 30.19² =
  31. 31.19² =
  32. 32.91² =
  33. 33.41² =
  34. 34.79² =
  35. 35.41² =
  36. 36.21² =
  37. 37.41² =
  38. 38.29² =
  39. 39.19² =
  40. 40.91² =

Answer key

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

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