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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 172 · 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. 2.69² =
  3. 3.81² =
  4. 4.71² =
  5. 5.69² =
  6. 6.91² =
  7. 7.89² =
  8. 8.31² =
  9. 9.79² =
  10. 10.19² =
  11. 11.39² =
  12. 12.89² =
  13. 13.69² =
  14. 14.21² =
  15. 15.71² =
  16. 16.19² =
  17. 17.51² =
  18. 18.79² =
  19. 19.69² =
  20. 20.91² =
  21. 21.69² =
  22. 22.19² =
  23. 23.49² =
  24. 24.31² =
  25. 25.39² =
  26. 26.19² =
  27. 27.81² =
  28. 28.71² =
  29. 29.21² =
  30. 30.71² =
  31. 31.19² =
  32. 32.49² =
  33. 33.91² =
  34. 34.91² =
  35. 35.19² =
  36. 36.49² =
  37. 37.49² =
  38. 38.71² =
  39. 39.29² =
  40. 40.19² =

Answer key

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

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