What is 19% of 2,300?

Correct.
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You can think of $$19\%$$ as $$20\% - 1\%$$:
> $$19\% \times 2{,}300 = 20\% \times 2{,}300 - 1\% \times 2{,}300$$
Use the 10% block:
>10% of 2,300 is 230, so 20% of 2,300 is 460.
Now use the 1% block:
>1% of 2,300 is 23.
Finally, subtract these values:
> $$20\% \times 2{,}300 - 1\% \times 2{,}300 = 460-23 = 437$$

Incorrect.
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Incorrect.
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Incorrect.
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Incorrect.
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396

413

437

451

460