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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 133 · 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. 1.61² =
  2. 2.19² =
  3. 3.29² =
  4. 4.41² =
  5. 5.79² =
  6. 6.21² =
  7. 7.71² =
  8. 8.61² =
  9. 9.89² =
  10. 10.89² =
  11. 11.41² =
  12. 12.19² =
  13. 13.91² =
  14. 14.49² =
  15. 15.51² =
  16. 16.69² =
  17. 17.41² =
  18. 18.91² =
  19. 19.29² =
  20. 20.81² =
  21. 21.69² =
  22. 22.41² =
  23. 23.19² =
  24. 24.81² =
  25. 25.19² =
  26. 26.29² =
  27. 27.81² =
  28. 28.89² =
  29. 29.89² =
  30. 30.61² =
  31. 31.29² =
  32. 32.91² =
  33. 33.41² =
  34. 34.19² =
  35. 35.89² =
  36. 36.81² =
  37. 37.79² =
  38. 38.31² =
  39. 39.79² =
  40. 40.59² =

Answer key

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

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