Question
Tia has 24 black or white buttons. She has 10 more white buttons than black buttons. How many white buttons does Tia have?
Answers
MathMate
Sum and difference problems can be solved mentally.
The bigger number is half of the 24+10=17 and the smaller number is half of 24-10 =7.
The bigger number is half of the 24+10=17 and the smaller number is half of 24-10 =7.