Kellen earned 133 coins in Fruit Ninja yesterday and 278 more today. How many coins has Kellen earned in the last two days?

Question

Julia Adams · Accepted Answer

Sometimes it is easier to add up numbers if they are in column form.

#133+278=411# #color(blue)("Starting point:")# #133# #ul(278) larr" add"# #ul(color(white)(278))# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ #color(blue)("RHS column - 1's")# Working from right hand side to left hand side #RHS->LHS# #color(red)(8+3)=11# so write it like this: #1color(white)(..)3color(white)(..)color(red)(3)# #ul(2color(white)(..)7color(white)(..)color(red)(8)) larr" add"# #ul(color(white)(2..7....)1)# #" "color(white)(.)1# Note the 10 carried to the tens column as 1 of 10 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ #color(blue)("The middle column - 10's")# Adding the middle column we now have #color(red)(3+7+1)=11# However, since this is a column of tens, we have one of ten and one of one hundred. Thus, we write: #1color(white)(..)color(red)(3)color(white)(..)3# #ul(2color(white)(..)color(red)(7)color(white)(..)8) larr" add"# #ul(color(white)(2...)1color(white)(..)1)# #1""color(white)(..)color(red)(1)# Take note that the 100's column has the 1 of 100's carried over. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ #color(blue)("The LHS column - 100's")# Adding the LHS column we now have #color(red)(1+2+1)=4# #color(red)(1)color(white)(..)3color(white)(..)3# #ul(color(red)(2)color(white)(..)7color(white)(..)8) larr" add"# #ul(4color(white)(...)1color(white)(..)1)# #color(red)(1)""color(white)(..)1# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ So #" "133+278=411#

Abigail Allen · Answer

undefined Kellen has earned 411 coins in the last two days.