← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 785 · 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. 2.59² =
  3. 3.19² =
  4. 4.29² =
  5. 5.31² =
  6. 6.79² =
  7. 7.49² =
  8. 8.29² =
  9. 9.41² =
  10. 10.81² =
  11. 11.61² =
  12. 12.51² =
  13. 13.19² =
  14. 14.21² =
  15. 15.29² =
  16. 16.61² =
  17. 17.51² =
  18. 18.69² =
  19. 19.59² =
  20. 20.29² =
  21. 21.19² =
  22. 22.71² =
  23. 23.21² =
  24. 24.91² =
  25. 25.41² =
  26. 26.29² =
  27. 27.89² =
  28. 28.39² =
  29. 29.41² =
  30. 30.19² =
  31. 31.79² =
  32. 32.49² =
  33. 33.61² =
  34. 34.19² =
  35. 35.61² =
  36. 36.29² =
  37. 37.71² =
  38. 38.61² =
  39. 39.79² =
  40. 40.69² =

Answer key

  1. 841
  2. 3481
  3. 361
  4. 841
  5. 961
  6. 6241
  7. 2401
  8. 841
  9. 1681
  10. 6561
  11. 3721
  12. 2601
  13. 361
  14. 441
  15. 841
  16. 3721
  17. 2601
  18. 4761
  19. 3481
  20. 841
  21. 361
  22. 5041
  23. 441
  24. 8281
  25. 1681
  26. 841
  27. 7921
  28. 1521
  29. 1681
  30. 361
  31. 6241
  32. 2401
  33. 3721
  34. 361
  35. 3721
  36. 841
  37. 5041
  38. 3721
  39. 6241
  40. 4761

Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths