$$4.44 \times 10 ^ { 13 } + 0.21 \times 10 ^ { 13 }$$
$46500000000000$
$$4.44\times 10000000000000+0.21\times 10^{13}$$
$$44400000000000+0.21\times 10^{13}$$
$$44400000000000+0.21\times 10000000000000$$
$$44400000000000+2100000000000$$
$$46500000000000$$
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$3\times 31\times 2^{11}\times 5^{12}$
