Can 10 plus 9 equal 21?

What is 200 plus 50 plus 5 in standard form? What number is halfway between 1420 and 1430? The square of a number is the second power of the number the cube of a number is the third power of the number explain why those names are reasonable? How many tiles come in a 24x24 box? How many times does the phrase desire spiritual gifts appear in the bible? What is the GCF of 51 and 175? What is 6 in roman number? Does an IQ of 130 qualify as an IQ acceptable for mensa membership? What is the noun form of circulate? What size feet should the average 5 year old have? When base apply on face? How many months is 27weeks on a calendar? What is the sum first 450 consecutive odd numbers? How old would you be if you were born in 1356? Which type of analytical tool would be most appropriate for displaying the information in the table? What is greater 4000m or 40km? How did Orval Faubus decide to stop integration? What number is in the hundred place 9.365? Is 13 higher then 13.0? In a Obtuse angled triangle what angle is opposite the longer side?