2 tens and 13 ones add up to 33 because 10 +10 +13 = 33.
4000
13+13+13=39
The tens place is two digits before the decimal point. To round it use the ones digit (left of the decimal point) to decide whether to round up (ones digit is 5 or more) or down (ones digit is 4 or less). In 907.457 the ones digit is 7 ehich is 5 or more, so it rounds up to 910.
19
350 rounded to nearest hundred is 400. After it is rounded, everything to the right of the hundreds place is set to zero. For the number 350, 3 is the hundreds place, 5 is the tens place, and 0 is the ones place. Since you are rounding to hundreds, look at the tens place digit: if it is 0-4, then hundreds digit is unchanged, but if it is 5-9 (like your question), then it rounds up, so you zero out the tens and ones digits then add 100 to that number.
If you are talking about normal numbers, then just add the up like this: 7 tens=70, 13 ones =1 ten and 3 ones =13. 70+13=83 Answer: 83 But, if you are talking about Roman numerals, then itβs: LXXXIII Hope that helps!
They add up to 72
The answer would be 37.
The answer depends on what the tens digit is greater than, and what the ones digit does then.
Assuming that "adds up to" means "its digits add up to" 888
4000
Add together the like terms. 5 thousands and 4 thousands makes 9 thousands. 3 hundred is a given. 2 tens is a given. 4 ones and 2 ones is 6 ones. You end up with: 9 thousand, 3 hundred, 2 tens, 6 ones. Just write down the numbers in order. "9326"
7
Roman numerals are not appropriate for doing even simple operations such as an addition. Pressumably, the ancient Romans had to use some other system, or perhaps an abacus, to do the actual addition. You can try using basically the same system you use for Arabic (i.e., our standard) numbers: add the ones and ten places separately; for the ones place in the result, split it up into tens and ones, and add the tens to the other part of the result.
660. remember when rounding to the nearest ten your lowest non zero number will be in the tens place and you will look at the ones place to decide whether or not to round up. If the ones place is 5 or above, round up in the tens place. If the ones place is 0-4 keep the remaining tens place number.
951
You are lining up the place value columns, so that the tens are under each other, the ones are under each other, the tenths are under each other, the hundredths are under each other, etc so that when you do the addition/subtraction you are adding/subtracting the tens from the tens, the ones from the ones, the tenths from the tenths, the hundredths from the hundredths, etc. The easiest way to line up the place value columns is to align the decimal points. Remember that an empty place value column is the same as that place value column containing a zero. When adding/subtracting whole numbers align the numbers at their right hand end. What you are doing is actually aligning the "hidden" decimal points - the decimal point sits between the ones place value column and the tenths place value column; when there is no decimal part of a number, the decimal point (and trailing zeros) are not written, so it is "hiding" after the last (ones) digit of the number.