11-12-2015
Mathematics

contestada

break apart the addends to find the sum 18+21

Respuesta :

WorldCitizen WorldCitizen

11-12-2015

we break apart the first numer:

10+8

the second:

20+1

and add like this:

18+21=10+8 + 20+1

now, we can mix up the order:

18+21=10+8 + 20+1= 10+20 + 8+1

add the parts:

18+21=10+8 + 20+1= 10+20 + 8+1=30+9=39

Answer Link

Otras preguntas

Suppose a magnetic reversal accoured today . How would new rocks at mid ocean ridges differ from rocks that formed last year

Is Ba(NO3)2 covalent or ionic

In the Great Gatsby, Tom and Nick were both in the same senior society at what college?a. Harvardb. Princetonc. Yaled. Stanford

Applewood Elementary boasts a student to teacher ratio of 14 : 1. What percent of the school makes up the number of teachers at Applewood Elementary? (Round pe

Consider the equation 5x+7=22 What two operations are represented in this equation?? How would you "undo" each of those operations Which operation should you "

A student who weighs 500 newtons climbed the stairs from the first floor to the third floor,15 meters above, in 20 seconds. How much work did she do

How are hot spots used to track plate motion

How do the daughter cells compare to the parent cells ?

the pet store sells bags of pet food. there are 4 bags of cat food. one sixth of the bags of food are bags of cat food. how many bags of pet food does the pet s

how do i do the equation 2+6 divided by 3 divided by 1 with an exponent of 8?