On another day, martin bought 12 3/5 pounds of grapes for a picnic. his friend bought 3/8 of that amount. use compatible fractions to estimate how many pounds of grapes martin's friend bought.

Based on the fractions given, the number of pounds of grapes that are bought will be 4 29/40 pounds.

Since we're are given the information that Martin bought 12 3/5 pounds of grapes for a picnic while his friend bought 3/8 of that amount.

Therefore, the amount that his friend bought will be:

= 3/8 × 12 3/5

= 3/8 × 63/5

= 189/40

= 4 29/40

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6 lb  

Step-by-step explanation:

Compatible fractions and numbers are ones that are easy to use when doing calculations in your head.

Martin's friend bought  ⅜ × 12⅗ lb of grapes.

⅜ is not a compatible fraction. However,

⁴/₈ = ½, which is a compatible fraction.

12⅗ is not a compatible number. However, we can drop the fractional part and get

12, which is a compatible number.

To make the estimate, we can say

⅜ × 12⅗ ≈ ½ × 12 = 6

Martin's friend bought approximately 6 lb of grapes.