Cogito
Grade 5 Math · Chapter 1 · Lesson 1
Ten Times and One Tenth
Every place is worth ten of the one to its right.
8 problems · about 15 minutes · 5.NBT.A.1
What this lesson teaches
The child explains that a digit is ten times the place to its right and one tenth of the place to its left.
- Each place is ten times the place to its right.
- Each place is one tenth of the place to its left.
- The pattern carries straight on past the decimal point.
Warm Up
Straightforward practice. Get the method working first.
4 problems600 ÷ 10 = ?
Answer 60
Why 60.
What does moving a digit one place left do to its value?
Answer Multiplies it by 10.
Why Each place left is worth ten times more.
80 × 10 = ?
Answer 800
Why One place left.
900 ÷ 10 = ?
Answer 90
Why One place right.
Build It Up
The same ideas with more to keep track of.
2 problemsIn 5,500, what is the left 5 worth?
Answer 5000
Why Thousands place.
What is one place right of the ones called?
Answer Tenths.
Why Each step right divides by 10.
Stretch Yourself
Mixed problems. Work out what kind of question it is before you start.
2 problemsThe Two Digits: In 3,300, how many times bigger is the left 3 than the right one?
Answer 10 times
Why Each place left is ten times bigger.
The Other Way: 700 divided by 10 gives what?
Answer 70
Why 70, one place to the right.