Donna has actually been a teacher, mathematics instructional coach, interventionist, and also curriculum coordinator. A regular speaker in ~ state and also national conferences, she shares her love for math with a worldwide audience with her website, mathematics Coach’s Corner. Donna is also the co-author the Guided math Workshop.

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Comparison individually is really tricky because that kids. Part of that is a absence of exposure. We commonly teach subtraction together take away, and that is certainly one of the subtraction structures. But we need to move past that and aid students recognize that comparing additionally involves subtraction.

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A common means to expression comparison subtraction troubles is how numerous more? there are numerous variations on that phrase: just how much taller, how much more, how much faster, how countless fewer, etc. Let’s look at a problem:

Marla has actually 5 piece of candy. Carlos has actually 3 pieces of candy. Exactly how many much more pieces of liquid does Marla have actually than Carlos?

A really common error is to say 5. In various other words, they simply say the number the is bigger. Ns read, i think in Kathy Richardson’s How children Learn Number Concepts, that children hear how much is the number the is more? instead of how plenty of more? I believed that was yes, really interesting.

Another means comparison subtraction have the right to be worded is what is the difference? so the concern in ours candy difficulty would sound like What is the difference in the piece of liquid Marla has and the piece of candy Carlos has?

So just how do we help children understand comparison subtraction? of course, it needs to be concrete learning–counters, linking cubes, etc. I indicate a straight comparison, as presented in the picture. Construct each number, lining them up one on height of the other. Assist students to see that approximately a details point, they had the very same number (3), yet Martha has 2 more. Think about using a two-part question: Who has actually more? How numerous more?