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3.Aling Rosa bought 0.81 kg of fish. She placed 0.25 of it in the refrigerator and cooked the rest. Estimate how much kilogram of fish she refrigerated?

4. A Math book is 3.78 centimeters thick. How thick will 21 Math books on a shelf be?

1. what is asked?
2. what are given?
3. what operation?
4. what is number sentence?
5. what is the answer? ​