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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 16 · 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. 1.79² =
  2. 2.19² =
  3. 3.59² =
  4. 4.19² =
  5. 5.59² =
  6. 6.79² =
  7. 7.91² =
  8. 8.49² =
  9. 9.89² =
  10. 10.31² =
  11. 11.49² =
  12. 12.81² =
  13. 13.39² =
  14. 14.79² =
  15. 15.29² =
  16. 16.21² =
  17. 17.59² =
  18. 18.21² =
  19. 19.21² =
  20. 20.59² =
  21. 21.39² =
  22. 22.89² =
  23. 23.19² =
  24. 24.19² =
  25. 25.21² =
  26. 26.81² =
  27. 27.21² =
  28. 28.51² =
  29. 29.69² =
  30. 30.51² =
  31. 31.31² =
  32. 32.79² =
  33. 33.21² =
  34. 34.49² =
  35. 35.89² =
  36. 36.81² =
  37. 37.81² =
  38. 38.91² =
  39. 39.59² =
  40. 40.61² =

Answer key

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

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