## Thursday, September 12, 2013

### Math problems of the week: 4th grade Investigations vs. Singapore Math

Introducing fractions of whole numbers in Investigations vs. Singapore Math

I. From the 4th grade Investigations Student Activity Book, "Fraction Cards and Decimals Squares" chapter [click to enlarge]:

II. From the 4th grade Singapore Math Primary Mathematics 4A Workbook, "Fractions" chapter [click to enlarge]:

III. Extra Credit

Which is more likely: that Investigations moves on to "Story Problems about 25," or that Singapore Math moves on to abstract, non-pictorial representations?

FedUpMom said...

Katharine, you've got the same Investigations image twice.

The child who filled in the Investigations page needs some serious tutoring. Apparently, she thinks that 24 divided by 3 is 3. Also, the misuse of the equals sign is horrifying. 1/4 = 6? Really?

Katharine Beals said...

Thanks; fixed!
Yes, remediation doesn't figure into the Reform Math algorithm. Instead it's teach and (perhaps) assess, and then move on.

Auntie Ann said...

The math-facts errors on the Inv. pages are bad, but I wonder this: did the teacher discourage the use of what I'll call: the continuous equals sign?

24 / 8 = 3 * 2 = 6 + 5 = 11 - 2 = 9 ^ 2 = 81 / 3 = 27 + 3 = 30 / 5 = 6

It's so easy to slip into doing this. If it's not equal, don't say it is!

Jennifer said...

Katherine, I've just found your blog. Which Singapore math books are you taking your problems from? Standard ed or US ed? I've just moved to a district where they use Everyday math and two weeks into 4th grade we are struggling. We after-schooled 1st grade previously with US edition, but now trying to figure out which edition will mirror the Everyday Math. Thank you!

Auntie Ann said...

Singapore math offers a placement guide and even placement tests: http://www.singaporemath.com/Placement_Guide_s/85.htm

I used 5th grade Standard with our 5th grader (who had EM at school), and it seemed a good match. He and I had done a lot of work at home previously, though.

Remember, EM doesn't stress math facts, so some sort of minute-math routine is important too.

Katharine Beals said...

Mostly what I have are the Standards editions, which have some additional data analysis and probability, added to satisfy the California state requirements. Otherwise, I don't think there is a huge difference between the two. See http://www.singaporemath.com/FAQ_Primary_Math_s/15.htm