← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 97 · 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. 1.89² =
  2. 2.89² =
  3. 3.21² =
  4. 4.51² =
  5. 5.89² =
  6. 6.59² =
  7. 7.29² =
  8. 8.89² =
  9. 9.39² =
  10. 10.91² =
  11. 11.51² =
  12. 12.91² =
  13. 13.19² =
  14. 14.49² =
  15. 15.59² =
  16. 16.19² =
  17. 17.41² =
  18. 18.69² =
  19. 19.29² =
  20. 20.41² =
  21. 21.69² =
  22. 22.59² =
  23. 23.89² =
  24. 24.81² =
  25. 25.61² =
  26. 26.29² =
  27. 27.59² =
  28. 28.61² =
  29. 29.19² =
  30. 30.89² =
  31. 31.61² =
  32. 32.91² =
  33. 33.49² =
  34. 34.39² =
  35. 35.71² =
  36. 36.19² =
  37. 37.89² =
  38. 38.49² =
  39. 39.51² =
  40. 40.79² =

Answer key

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

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