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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 174 · 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. 1.81² =
  2. 2.81² =
  3. 3.39² =
  4. 4.51² =
  5. 5.31² =
  6. 6.79² =
  7. 7.91² =
  8. 8.69² =
  9. 9.49² =
  10. 10.91² =
  11. 11.29² =
  12. 12.21² =
  13. 13.69² =
  14. 14.81² =
  15. 15.89² =
  16. 16.19² =
  17. 17.41² =
  18. 18.41² =
  19. 19.29² =
  20. 20.41² =
  21. 21.49² =
  22. 22.81² =
  23. 23.61² =
  24. 24.31² =
  25. 25.89² =
  26. 26.31² =
  27. 27.49² =
  28. 28.29² =
  29. 29.59² =
  30. 30.71² =
  31. 31.29² =
  32. 32.79² =
  33. 33.91² =
  34. 34.71² =
  35. 35.69² =
  36. 36.19² =
  37. 37.21² =
  38. 38.29² =
  39. 39.61² =
  40. 40.21² =

Answer key

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

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