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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 155 · 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. 1.19² =
  2. 2.59² =
  3. 3.31² =
  4. 4.49² =
  5. 5.29² =
  6. 6.31² =
  7. 7.71² =
  8. 8.41² =
  9. 9.29² =
  10. 10.49² =
  11. 11.91² =
  12. 12.41² =
  13. 13.71² =
  14. 14.91² =
  15. 15.81² =
  16. 16.49² =
  17. 17.79² =
  18. 18.91² =
  19. 19.69² =
  20. 20.59² =
  21. 21.79² =
  22. 22.49² =
  23. 23.81² =
  24. 24.91² =
  25. 25.59² =
  26. 26.51² =
  27. 27.41² =
  28. 28.91² =
  29. 29.69² =
  30. 30.71² =
  31. 31.61² =
  32. 32.81² =
  33. 33.61² =
  34. 34.21² =
  35. 35.49² =
  36. 36.19² =
  37. 37.71² =
  38. 38.71² =
  39. 39.59² =
  40. 40.71² =

Answer key

  1. 361
  2. 3481
  3. 961
  4. 2401
  5. 841
  6. 961
  7. 5041
  8. 1681
  9. 841
  10. 2401
  11. 8281
  12. 1681
  13. 5041
  14. 8281
  15. 6561
  16. 2401
  17. 6241
  18. 8281
  19. 4761
  20. 3481
  21. 6241
  22. 2401
  23. 6561
  24. 8281
  25. 3481
  26. 2601
  27. 1681
  28. 8281
  29. 4761
  30. 5041
  31. 3721
  32. 6561
  33. 3721
  34. 441
  35. 2401
  36. 361
  37. 5041
  38. 5041
  39. 3481
  40. 5041

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