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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 154 · 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. 1.39² =
  2. 2.69² =
  3. 3.59² =
  4. 4.49² =
  5. 5.19² =
  6. 6.59² =
  7. 7.81² =
  8. 8.29² =
  9. 9.59² =
  10. 10.31² =
  11. 11.79² =
  12. 12.51² =
  13. 13.51² =
  14. 14.81² =
  15. 15.79² =
  16. 16.61² =
  17. 17.19² =
  18. 18.51² =
  19. 19.31² =
  20. 20.69² =
  21. 21.19² =
  22. 22.81² =
  23. 23.49² =
  24. 24.19² =
  25. 25.19² =
  26. 26.19² =
  27. 27.29² =
  28. 28.19² =
  29. 29.91² =
  30. 30.29² =
  31. 31.61² =
  32. 32.21² =
  33. 33.19² =
  34. 34.49² =
  35. 35.61² =
  36. 36.69² =
  37. 37.21² =
  38. 38.71² =
  39. 39.21² =
  40. 40.49² =

Answer key

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

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