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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 451 · 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. 1.69² =
  2. 2.91² =
  3. 3.91² =
  4. 4.79² =
  5. 5.59² =
  6. 6.71² =
  7. 7.21² =
  8. 8.89² =
  9. 9.61² =
  10. 10.29² =
  11. 11.59² =
  12. 12.61² =
  13. 13.91² =
  14. 14.29² =
  15. 15.19² =
  16. 16.81² =
  17. 17.41² =
  18. 18.29² =
  19. 19.59² =
  20. 20.71² =
  21. 21.79² =
  22. 22.61² =
  23. 23.41² =
  24. 24.19² =
  25. 25.41² =
  26. 26.19² =
  27. 27.71² =
  28. 28.19² =
  29. 29.21² =
  30. 30.21² =
  31. 31.21² =
  32. 32.61² =
  33. 33.19² =
  34. 34.91² =
  35. 35.71² =
  36. 36.79² =
  37. 37.19² =
  38. 38.79² =
  39. 39.21² =
  40. 40.19² =

Answer key

  1. 4761
  2. 8281
  3. 8281
  4. 6241
  5. 3481
  6. 5041
  7. 441
  8. 7921
  9. 3721
  10. 841
  11. 3481
  12. 3721
  13. 8281
  14. 841
  15. 361
  16. 6561
  17. 1681
  18. 841
  19. 3481
  20. 5041
  21. 6241
  22. 3721
  23. 1681
  24. 361
  25. 1681
  26. 361
  27. 5041
  28. 361
  29. 441
  30. 441
  31. 441
  32. 3721
  33. 361
  34. 8281
  35. 5041
  36. 6241
  37. 361
  38. 6241
  39. 441
  40. 361

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