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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 634 · 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. 1.21² =
  2. 2.69² =
  3. 3.19² =
  4. 4.41² =
  5. 5.51² =
  6. 6.41² =
  7. 7.31² =
  8. 8.61² =
  9. 9.21² =
  10. 10.21² =
  11. 11.19² =
  12. 12.31² =
  13. 13.91² =
  14. 14.71² =
  15. 15.89² =
  16. 16.29² =
  17. 17.49² =
  18. 18.79² =
  19. 19.21² =
  20. 20.41² =
  21. 21.49² =
  22. 22.79² =
  23. 23.91² =
  24. 24.81² =
  25. 25.19² =
  26. 26.79² =
  27. 27.71² =
  28. 28.19² =
  29. 29.41² =
  30. 30.89² =
  31. 31.19² =
  32. 32.91² =
  33. 33.69² =
  34. 34.61² =
  35. 35.81² =
  36. 36.89² =
  37. 37.41² =
  38. 38.71² =
  39. 39.29² =
  40. 40.71² =

Answer key

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

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