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40.) 
4(1)/(2)×3(1)/(7)
41.) 
2(1)/(3)×6(1)/(2)
42.) 
1(1)/(2)×5(2)/(3)

4040.) 412×317 4 \frac{1}{2} \times 3 \frac{1}{7} \newline4141.) 213×612 2 \frac{1}{3} \times 6 \frac{1}{2} \newline4242.) 112×523 1 \frac{1}{2} \times 5 \frac{2}{3}

Full solution

Q. 4040.) 412×317 4 \frac{1}{2} \times 3 \frac{1}{7} \newline4141.) 213×612 2 \frac{1}{3} \times 6 \frac{1}{2} \newline4242.) 112×523 1 \frac{1}{2} \times 5 \frac{2}{3}
  1. Calculate total rolls needed: First, we need to divide the total amount of tape needed by the amount of tape on each roll. 8,000cm÷2,000cm=48,000 \, \text{cm} \div 2,000 \, \text{cm} = 4 rolls.