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Math Update – Week 3

September 25, 2018 by Kim Sorensen & Rebecca Farley

Last week we finished up one of our place value standards which involved writing numbers in different forms, comparing and ordering and number patterns.  We tested on these skills on Thursday and I feel that both classes did well.

In 4th grade:

This week we are multiplying with multiples!  This is a standard that if you know your math facts, is kind of a fun one!  We will talk about how when a digit moves one place to the left its value becomes 10 times greater.  We solve problems using different multiples of 10, 100, 1,000, etc.

A problem might look like:

8 x 20 = 160

8 x 2,000 = 16,000

8 x 200,000 = 1,600,000

8 x 2 = 16

8 x 200 = 1,600

We will then talk about the reverse idea.  If a digit moves one place to the right its value is divided by 10.

200,000 ÷ 4 = 50,000

200 ÷ 4 = 50

20 ÷ 4 = 5

2,000 ÷ 4 = 500

We will look at patterns to help us solve these problems.

Questions to ask your child this week:

  • What happens to a digits value when it moves one place to the left?
  • What happens to a digits value when it moves one place to the right?

In 3rd grade:

We will begin rounding!  This is such a tough standard!  At the beginning of the week we look at number lines and determine what intervals are shown on the number line.  We talk about what the halfway point, or mid point is between two intervals.  We will then use a number line to help us visualize what multiple a number is closer to, or what we round to.  This will take some determination and hard work from our 3rd graders, but they can do it!

Questions to ask your child this week:

  • Have them count by 10s and 100s.
  • Give them a number like 700 and have them start counting by 100s from there.
  • Count by 10s starting at 1,450
  • Ask them the halfway point between two multiples – 230 and 240, 1,700 and 1,800, etc.