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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 295 · 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. 2.81² =
  3. 3.19² =
  4. 4.49² =
  5. 5.69² =
  6. 6.69² =
  7. 7.19² =
  8. 8.81² =
  9. 9.69² =
  10. 10.39² =
  11. 11.89² =
  12. 12.29² =
  13. 13.19² =
  14. 14.79² =
  15. 15.61² =
  16. 16.69² =
  17. 17.41² =
  18. 18.81² =
  19. 19.41² =
  20. 20.39² =
  21. 21.89² =
  22. 22.49² =
  23. 23.61² =
  24. 24.39² =
  25. 25.49² =
  26. 26.49² =
  27. 27.61² =
  28. 28.81² =
  29. 29.89² =
  30. 30.71² =
  31. 31.91² =
  32. 32.19² =
  33. 33.81² =
  34. 34.61² =
  35. 35.19² =
  36. 36.89² =
  37. 37.19² =
  38. 38.29² =
  39. 39.31² =
  40. 40.51² =

Answer key

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

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