Hi. was William of orange the first and only foreigner to invade the United Kingdom and become king when displacing James the second in 1689

An underestimate will occur when all the figures (or a majority of them) are rounded downward significantly. By doing this, the estimated figure will necessarily be lower than the actual calculated figure. When rounding, knowing which direction the rounding is in will give a picture of what the figure's relation to the actual answer will be.