What numbers can go in 13?

Why was the abacus so important? What is the name of the eleven sided US coin? In step 4 of the construction of a perpendicular line through a point why must the compass point be placed on the points where the arc intersects with the original line How would the construction be d? What is the ratio of a to b? How many liters are contained in 0.7803 kilometers? How many square feet are in 10-inch circle? 11.25 rounded to the nearest tenth answer? What is the place value of 3 in 0.3? How do I write 2billion 9 million 6 thousand 1 in standard form? What is 2399 rounded to nearest thousand? National highway no7 is how many kilometer long? How many times is thanks in the book of psalms? How do you use a factor tree to find prime factorization of 244? What is 5 544 divisible by? What is the value of 5 in 21.57 as a decimal? 4 times what equal 168? What is SO qty stand for? What is the percent of 10.5 out of 20? What does it mean if two parallel lines are intersected by a transversal? What Barclays branch has sort code 20-13-42?