← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 38 · 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. 2.69² =
  3. 3.69² =
  4. 4.21² =
  5. 5.41² =
  6. 6.81² =
  7. 7.79² =
  8. 8.41² =
  9. 9.19² =
  10. 10.31² =
  11. 11.79² =
  12. 12.19² =
  13. 13.29² =
  14. 14.39² =
  15. 15.51² =
  16. 16.21² =
  17. 17.41² =
  18. 18.19² =
  19. 19.49² =
  20. 20.29² =
  21. 21.49² =
  22. 22.79² =
  23. 23.89² =
  24. 24.51² =
  25. 25.19² =
  26. 26.81² =
  27. 27.79² =
  28. 28.29² =
  29. 29.81² =
  30. 30.79² =
  31. 31.69² =
  32. 32.31² =
  33. 33.79² =
  34. 34.59² =
  35. 35.29² =
  36. 36.89² =
  37. 37.91² =
  38. 38.81² =
  39. 39.19² =
  40. 40.61² =

Answer key

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

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