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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 6 · 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. 1.41² =
  2. 2.41² =
  3. 3.79² =
  4. 4.29² =
  5. 5.49² =
  6. 6.29² =
  7. 7.39² =
  8. 8.19² =
  9. 9.91² =
  10. 10.29² =
  11. 11.59² =
  12. 12.79² =
  13. 13.49² =
  14. 14.81² =
  15. 15.51² =
  16. 16.21² =
  17. 17.71² =
  18. 18.51² =
  19. 19.89² =
  20. 20.89² =
  21. 21.79² =
  22. 22.41² =
  23. 23.71² =
  24. 24.49² =
  25. 25.59² =
  26. 26.29² =
  27. 27.69² =
  28. 28.49² =
  29. 29.29² =
  30. 30.41² =
  31. 31.49² =
  32. 32.69² =
  33. 33.39² =
  34. 34.21² =
  35. 35.41² =
  36. 36.81² =
  37. 37.39² =
  38. 38.19² =
  39. 39.61² =
  40. 40.79² =

Answer key

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

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