Preheat oven to 350 degrees F (175 degrees C).
Place sweet potatoes in a 10×6 inch shallow baking dish and pour orange juice over.
In a small bowl, combine flour, sugar, cinnamon and salt; mix together and cut in margarine. Sprinkle over sweet potatoes.
Bake for 30 minutes. Remove from oven, sprinkle with marshmallows and broil until browned.
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