Monday, March 12, 2012

Multiples of 10

Day One – Multiples of 10 – What are they?
Using cubes/counters represent a given number. Can you split that number of cubes into piles of 10 with none left over? If so, that number is a multiple of 10. Practice with several numbers – multiples and not (write them on the white board so students can see the numbers to decide about the pattern). Do you see a pattern/something similar about each number that is a multiple of 10? Describe the rule/pattern. (Numbers that end in 0 are multiples of 10)
Teach the students that to know what numbers are multiples of a number, just count by that number. (For example, to know what numbers are multiples of ten, just count by tens.)
Play slapjack with cards. Each player gets a “deck” of index cards with numbers on them.
Partner up. Players take turns flipping over 1 card into the middle. If the card
is a multiple of 10, the first player to slap it wins the stack. The goal is to capture all your opponent’s cards.

Day Two – Practice Adding 10 to a number
Briefly review yesterday’s lesson. Today we will practice adding 10 to a number. Each pair gets their own game board of chutes and ladders. Players alternate spinning the spinner and advancing as normal and rolling a die and advancing by that multiple of ten. (Example: if you rolled a four, you'd move up 40 spaces.)
* Final challenge round (if time)– figure out the answer to this math problem – The zoo had 650 tigers and 1,000 leopards. They sold 230 tigers and 100 leopards. Then they got 60 more leopards and 70 more tigers. How many were there in all?

Day Three – Add 10 to the target number
Today we’ll be having a race like Family Feud. Split into 2 teams – sit together in circles on the floor. Distribute a dry-erase paddle, marker, and tissue for erasing to each member of the team. We’ll be taking turns answering a number about multiples of 10. Everyone should write the answer on his or her dry erase paddle. When it is your turn, you’ll be showing your paddle to the teacher to determine whether or not your team will receive a point.
**I’ll tie in pennies and dimes today while doing this review activity.
*Final Challenge Round (if time) – As a team – add multiples of 10 to these numbers then order them greatest to least. (30, 70, 140, 330, 320, 590)

Day Four – Adding Multiples of 10
Pass our hundreds boxes and paper with addition problems. Use color chips/cubes to represent the number then add multiples of 10 to show the new number. Do a total of 10
problems front/back.
*Final Challenge Round (for fast-finishers)– revisit the day’s activity using subtraction.