We can use 100s for ones place, 10s for tenth place and 1s for hundredth place.
Addition of 4 and 7 in the hundredth places will give 11.
Replace 10 blocks with 1 tens block.
Add this 1 to 5 and 3 which are in tens place. This will be 1+5+3 = 9.
Addition of 1 and 2 in ones places 3.
Hence, the answer is 3.91.
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We can use 100s for ones place, 10s for tenth place and 1s for hundredth place.
Addition of 4 and 7 in the hundredth places will give 11.
Replace 10 blocks with 1 tens block.
Add this 1 to 5 and 3 which are in tens place. This will be 1+5+3 = 9.
Addition of 1 and 2 in ones places 3.
Hence, the answer is 3.91.