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What is 1 + 3?
All ___________ digits are significant.
All ___________ between ___________ digits are significant.
All zeros to the right of a nonzero are not significant - if there is not a ___________ or a ___________ above the zero.
Zeros to the ___________ of a decimal and ___________ of a nonzero digit are not significant.
Zeros to the ___________ of a decimal and ___________ of a nonzero digit are significant.
Leading zero's are ___________.