# data[].attributes.body
You can know to find the sum and the difference because if the question say how many more than you are subtraction and if it say how many than you are adding.

# data[].attributes.body
I don't n

# data[].attributes.body
you can chech it like if
50-20=30 you could check it like this you add 20 plus 30 and if it eaquals 50 you are right

# data[].attributes.body
I can tell if a answer is reasonable is if a answer make sent's or something that's when a answer is a reasonable one.

# data[].attributes.body
If you have 100 -10 you can,t say 1,409

# data[].attributes.body
recont do rows

# data[].attributes.body
I think its 100 because look at the sides of the jar  and solve it .

# data[].attributes.body
i know my awnser is correct if i solve it awnser the qusten.

# data[].attributes.body
if you have 100-10 you can't say 1,409

# data[].attributes.body
I can assess reasonableness by having a good reason. And if that dosen't work then i can have another good back up reason.

# data[].attributes.body
I can tell if it reasonable 50-30 = 20 i know it reasonable because I know 30+20=50 -20=30 so used my knowledge

# data[].attributes.body
I always try to recount when it is addition . And for subtraction I  do addition to check my answer . Sometimes I can estimate so if my answer is right or wrong.

# data[].attributes.body
the only reason why I think there are 100 marbles because there are a lot In the jar and it is one big spot of just marbles.

# data[].attributes.body
Like 40 - 10 it can't be 500 because you are subtraction so you are take it away.

# data[].attributes.body
i think i know my awnser is reasonable because i think i can go over it with my teacher and i can re look it because i might be right and i might be wrong so just can look at it and say to myself that am ready to show my taecher.

# data[].attributes.body
You can tell if it's close to the anwer it's like estimating and rounding example 56+43round to the nerest ten 56 round to 60/43 rounds 40 three is less than five four or less let it rest