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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 742 · 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. 2.41² =
  3. 3.91² =
  4. 4.59² =
  5. 5.69² =
  6. 6.49² =
  7. 7.39² =
  8. 8.29² =
  9. 9.29² =
  10. 10.19² =
  11. 11.79² =
  12. 12.49² =
  13. 13.61² =
  14. 14.71² =
  15. 15.49² =
  16. 16.69² =
  17. 17.61² =
  18. 18.61² =
  19. 19.91² =
  20. 20.29² =
  21. 21.91² =
  22. 22.29² =
  23. 23.19² =
  24. 24.89² =
  25. 25.89² =
  26. 26.29² =
  27. 27.49² =
  28. 28.21² =
  29. 29.19² =
  30. 30.69² =
  31. 31.39² =
  32. 32.81² =
  33. 33.81² =
  34. 34.41² =
  35. 35.89² =
  36. 36.19² =
  37. 37.49² =
  38. 38.81² =
  39. 39.51² =
  40. 40.91² =

Answer key

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

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