2. The rice dispenser can hold 49 3/4 kg of rice when full. Rita put 42 1/2 kg of rice in the dispenser. How many more kilogram of rice are needed to fill the vice dispenser?
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Answer:
asked:
how many more kg of rice are needed to fill the rice dispenser
given:
49 3/4kg of rice (can be fill the rice dispenser)
42 1/2kg of rice (Rita put in the dispenser)
operation:
subtraction
number sentence:
49 3/4kg - 42 1/2kg
answer:
49 3/4kg - 42 1/2kg
49×4+3/4kg - 42×2+1/2kg
199/4kg - 85/2kg
199/4kg - 85×2/2×2kg
199/4kg - 170/4kg
= 29/4kg or 7 1/4kg (should Rita need to fill up the rice dispenser)