-- 893 of them have no 4's.
-- Three of them have exactly one 4: 4xx, x4x, and xx4.
-- Three of them have exactly 2 4's: 44x, 4x4, and x44.
-- One of them has exactly three 4's: 444.
-- None has more than three 4's.
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There are 500 of 3-digit numbers begin with an odd one (100-199, 300-301, 500-599,700-799, and 900-999). In terms of "how many strings of", may filter or expand the above answer.
Multiply the numbers without the decimal points.Count the total number of digits after the decimal point in the original numbers and put the decimal point into the answer so that there are the same number of digits after the decimal point.Examples:2.4 x 3.24do 24 x 324 = 7776 There is one digit in 2.4 and two in 3.24 after the decimal points making three digits in total, so insert the decimal point into the answer so that there are three digits after it: 7776 → 7.776⇒ 2.4 x 3.24 = 7.7762.5 x 3.26do 25 x 326 = 8150 There is one digit in 2.5 and two in 3.26 after the decimal points making three digits in total, so insert the decimal point into the answer so that there are three digits after it: 8150 → 8.150⇒ 2.5 x 3.26 = 8.152.5 x 0.02do 25 x 2 = 50 There is one digit in 2.5 and two in 0.02 after the decimal points making three digits in total, so insert the decimal point into the answer so that there are three digits after it: 50 → 0.050⇒ 2.5 x 0.02 = 0.05
Six and three fourths in decimal form is 6.75 exactly.
To the left of the decimal point, you place a decimal at an interval of every three digits.
Three. This refers to the number of significant digits AFTER the decimal point.