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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 301 · 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. 1.71² =
  2. 2.81² =
  3. 3.79² =
  4. 4.49² =
  5. 5.51² =
  6. 6.29² =
  7. 7.69² =
  8. 8.81² =
  9. 9.21² =
  10. 10.29² =
  11. 11.31² =
  12. 12.81² =
  13. 13.91² =
  14. 14.49² =
  15. 15.49² =
  16. 16.91² =
  17. 17.19² =
  18. 18.91² =
  19. 19.71² =
  20. 20.69² =
  21. 21.79² =
  22. 22.89² =
  23. 23.79² =
  24. 24.39² =
  25. 25.69² =
  26. 26.81² =
  27. 27.41² =
  28. 28.69² =
  29. 29.91² =
  30. 30.49² =
  31. 31.19² =
  32. 32.41² =
  33. 33.51² =
  34. 34.19² =
  35. 35.59² =
  36. 36.79² =
  37. 37.59² =
  38. 38.61² =
  39. 39.19² =
  40. 40.71² =

Answer key

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

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