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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 169 · 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. 1.51² =
  2. 2.69² =
  3. 3.71² =
  4. 4.21² =
  5. 5.71² =
  6. 6.61² =
  7. 7.61² =
  8. 8.29² =
  9. 9.49² =
  10. 10.49² =
  11. 11.49² =
  12. 12.19² =
  13. 13.71² =
  14. 14.79² =
  15. 15.91² =
  16. 16.69² =
  17. 17.19² =
  18. 18.19² =
  19. 19.19² =
  20. 20.79² =
  21. 21.51² =
  22. 22.49² =
  23. 23.79² =
  24. 24.29² =
  25. 25.91² =
  26. 26.41² =
  27. 27.49² =
  28. 28.69² =
  29. 29.91² =
  30. 30.29² =
  31. 31.61² =
  32. 32.29² =
  33. 33.41² =
  34. 34.61² =
  35. 35.71² =
  36. 36.61² =
  37. 37.31² =
  38. 38.19² =
  39. 39.89² =
  40. 40.31² =

Answer key

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

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