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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 660 · 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. 1.29² =
  2. 2.39² =
  3. 3.91² =
  4. 4.29² =
  5. 5.19² =
  6. 6.59² =
  7. 7.81² =
  8. 8.69² =
  9. 9.91² =
  10. 10.59² =
  11. 11.19² =
  12. 12.19² =
  13. 13.79² =
  14. 14.19² =
  15. 15.41² =
  16. 16.71² =
  17. 17.59² =
  18. 18.21² =
  19. 19.69² =
  20. 20.69² =
  21. 21.19² =
  22. 22.61² =
  23. 23.29² =
  24. 24.39² =
  25. 25.21² =
  26. 26.19² =
  27. 27.29² =
  28. 28.49² =
  29. 29.91² =
  30. 30.29² =
  31. 31.51² =
  32. 32.39² =
  33. 33.51² =
  34. 34.81² =
  35. 35.69² =
  36. 36.89² =
  37. 37.79² =
  38. 38.79² =
  39. 39.79² =
  40. 40.29² =

Answer key

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

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