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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 166 · 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. 1.79² =
  2. 2.79² =
  3. 3.89² =
  4. 4.39² =
  5. 5.49² =
  6. 6.39² =
  7. 7.89² =
  8. 8.89² =
  9. 9.19² =
  10. 10.81² =
  11. 11.79² =
  12. 12.91² =
  13. 13.61² =
  14. 14.81² =
  15. 15.49² =
  16. 16.71² =
  17. 17.89² =
  18. 18.51² =
  19. 19.91² =
  20. 20.31² =
  21. 21.91² =
  22. 22.91² =
  23. 23.89² =
  24. 24.89² =
  25. 25.69² =
  26. 26.31² =
  27. 27.29² =
  28. 28.29² =
  29. 29.21² =
  30. 30.29² =
  31. 31.31² =
  32. 32.81² =
  33. 33.19² =
  34. 34.91² =
  35. 35.81² =
  36. 36.31² =
  37. 37.21² =
  38. 38.41² =
  39. 39.79² =
  40. 40.61² =

Answer key

  1. 6241
  2. 6241
  3. 7921
  4. 1521
  5. 2401
  6. 1521
  7. 7921
  8. 7921
  9. 361
  10. 6561
  11. 6241
  12. 8281
  13. 3721
  14. 6561
  15. 2401
  16. 5041
  17. 7921
  18. 2601
  19. 8281
  20. 961
  21. 8281
  22. 8281
  23. 7921
  24. 7921
  25. 4761
  26. 961
  27. 841
  28. 841
  29. 441
  30. 841
  31. 961
  32. 6561
  33. 361
  34. 8281
  35. 6561
  36. 961
  37. 441
  38. 1681
  39. 6241
  40. 3721

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