If I had to fill in the blank, I'd probably do it like this. 49 + 1 makes 50, and 28 more make 78. Since 1 + 28 is 29, the blank gets filled with 29 and the complete sentence is

49 + 29 = 78

A third grader might not jump to 28, but might add by 10s to get 60, 70, and then 8 more to get 78. If one were counting out change, one might count 49 + 1 makes 50, 8 more make 58, and 20 makes 78. The change is 1+8+20 = 29. A certain amount of planning and short-term memory are involved. _____ Fundamentally, this is algebra. Somehow people forget how to do it from 3rd grade to 7th grade, or they get shaken by the use of a variable instead of a blank. 49+x = 78, x = 78-49 = 29.

What I like to do in this situation is round out one of the numbers so it is an even tens number. So if you add one to each side of the problem you get 79-50, which is a much more reasonable problem to solve than 78-49. I hope that helps, click here if you want to see some more helpful math tips.

You should practice more of math but not in a boring way. As for math worksheets, try this website that has free math worksheets for K to grade 5. Plus, it has holiday theme worksheets too like Christmas worksheets,Halloween worksheets and much more.

You’re doing this just like my younger brother lol, he doesn’t understand that he simply needs 78 - 49 to find out the “x”. In spite of the fact it’s an elementary algebra, I understand that not all of the people have inclinations to Mathematics and this is not a crime. Happily there are lots of helpful sources in the web with helpful materials, you can find all the necessary printables here https://myschoolsmath.com/ .

Well I actually can because when I was in 3rd grade I loved math.So first you Put them like 78-49= then you cross out the 7 and make it a 6 then make the one that you crossed off 10 instead of just 1.Then you have 18 over the 9 and 6 over the 4. After that you subtract 18-9=9 and6-4=2 so then you have 29.

Ohh tht very easy what you do to get the answer is subtract both of the number so 79 - 49 = 29 so the equation will be 29 + 49 = 79 I love math and I am good at it if you need help just let me no ok bye see you

49 + _____ = 78 The question is asking for a missing addend. Addends are the numbers added together to get an answer. You have to turn your subtraction sentence around to make an addition sentence; therefore using the greatest number as your answer in an addition sentence. You already have one addend (49), you just need to find the missing addend (??) to equal 78. That part I'll let you figure out on your own so you can say you found the answer.