posted by .

Never thought I would have a problem with Gr. 3 math - lol - but it goes like this. Write the addition or subtraction fact you will use to calculate each answer. Then add or subtract.
70 50 120 160
+30 +60 -30 -80

My question is what would the fact be???

Are we supposed to read each problem down?

If you mean 70 + 30, etc., then each math fact is the number without the zero, I'd think. So these would be the math facts:

7+3
5+6
12-3
16-8

Since all the problems have zeroes in the ones column (place), you really don't have to think about them. Just add or subract the other numbers to solve the problems and add the zero to the answer.

Yes? No?

??

Yes - that was what I ws thinking too so I guess I am right - I just second guess myself - I mean some of this for a Grade 3 seems rather difficult.

I think the object is to teach place value, right? Kids already know those particular math facts from grade 2, I think, so now to use those facts in more complex problems -- and to begin to understand the concept of zero -- would probably be the goal.

??

## Similar Questions

1. ### conjectures

Evaluate the following sums: 1 1+8 1+8+27 1+8+27+64 Add two more line to the list, and make a conjecture about the sums you obtained. this is a pattern. if you look closely than you'll see each number is a product of another number …
2. ### conjectures

I'm finishing my math 20 Pure. This is my last 20 course then i have 30's. Also I have to work a full time job so that I can live on my own with my boy. So it is tough but I'm doing alright. What about you?
3. ### math,correction

Problem #1 subtract. Express your answer in simplest form (3x)/(18) minus (x)/(18) MY steps: (3x-x)/(18) = (2x)/(18) and answer: (2x)/(18) Problem #18 write in simplest form. (3x^5)/(15x^12) My steps: (3)/(15) = .60 x^5-12 = x^-7 so …

I cannot get my brain around questions like this: 1/4 divided by 2/5 = 2/4 x ?
5. ### Algebra 2

Using synthetic division: x^3 + 4x^2 - 3x - 12 / x^2 - 3 Write it out like a long division problem. x^-3 goes into x^3 + 4x^2 -3x -12x times. This is the first term of the answer. Multiply x by x^2 -3 and write the product under the …
6. ### basic math

In my book A bread piece calls for 3 1/4 cups of flour if you only have 2 1/8 cup. How much more flour is needed?
7. ### MATH 156

What models can be used to help explain the concepts of addition and subtraction of rational numbers?
8. ### 3rd math homework

number sense write a subtraction fact using 6 such as 6 - ?
9. ### Geometry

Given: 7x + 2 = 2 + 5x – 6 Prove: x = –3 Given the equation 7x + 2 = 2 + 5x – 6, use the commutative property to rearrange the terms so that like terms are next to one another. This gives the equation 7x + 2 = 2 – 6 + 5x. Then, …
10. ### Math

How is combing radicals by addition and subtraction similar to combining monomial expressions by addition and subtraction?

More Similar Questions