Lacevedo525 Lacevedo525
  • 22-09-2015
  • Mathematics
contestada

Break apart addends make a ten or a hundred to add mentally 339+123

Respuesta :

ZigZag27 ZigZag27
  • 22-09-2015
9+3=12
30+20=50
300+100=400
Then add.
12+50+400=462
So 339+123=462
Answer Link

Otras preguntas

The time t required to drive a certain distance varies inversely with the speed r. If it takes 2 hours to drive the distance at 40 miles per hour, how long will
Solve for x. 10x^2=29x-21 does anyone know this
Rationalize the denominator and simplify-[tex] \frac{ \sqrt{6} }{ \sqrt{3} - \sqrt{2} } [/tex]
what is 12.2billion divided by 3.8%
Omg i'm confuse 7(x+4) =9(x -2)
The time t required to drive a certain distance varies inversely with the speed r. If it takes 2 hours to drive the distance at 40 miles per hour, how long will
Would there be a problem or a major event in a horror story?
the continuous muscular tube of the digestive system is called the
What is the algebraic expression for this story problem?A tank is filling with water from a natural spring well. Two days ago the water was 10 feet deep, and ye
I need help on this question please help?