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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 259 · 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. 2.69² =
  3. 3.21² =
  4. 4.91² =
  5. 5.69² =
  6. 6.89² =
  7. 7.79² =
  8. 8.69² =
  9. 9.69² =
  10. 10.41² =
  11. 11.61² =
  12. 12.39² =
  13. 13.21² =
  14. 14.59² =
  15. 15.71² =
  16. 16.49² =
  17. 17.29² =
  18. 18.69² =
  19. 19.59² =
  20. 20.51² =
  21. 21.69² =
  22. 22.89² =
  23. 23.79² =
  24. 24.81² =
  25. 25.21² =
  26. 26.71² =
  27. 27.71² =
  28. 28.19² =
  29. 29.29² =
  30. 30.81² =
  31. 31.69² =
  32. 32.31² =
  33. 33.51² =
  34. 34.81² =
  35. 35.61² =
  36. 36.41² =
  37. 37.29² =
  38. 38.81² =
  39. 39.21² =
  40. 40.69² =

Answer key

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

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