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?
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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.
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To find the addition or subtraction fact for each answer, you need to combine the numbers given in each column (70, 50, 120, 160) with the corresponding numbers given in the second row (+30, +60, -30, -80).
Let's go through each calculation one by one:
1. For the first calculation, you need to add 70 with 30. So the addition fact would be "70 + 30."
2. For the second calculation, you need to add 50 with 60. So the addition fact would be "50 + 60."
3. For the third calculation, you need to subtract 30 from 120. So the subtraction fact would be "120 - 30."
4. For the fourth calculation, you need to subtract 80 from 160. So the subtraction fact would be "160 - 80."
By knowing the addition or subtraction fact for each calculation, you can easily add or subtract the given numbers to find the answers.