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This week we will be focusing on subtraction!
By the end of the week we should demonstrate that we know how to take away using:•Concrete resources i.e objects•Number lines•10s frames•Number bonds
Other words which mean the same thing:
Let’s listen and learn! https://www.youtube.com/watch?v=QkPa9V2wtZs
Starter“I had 16 gold coins and captain hook took 7 of them away from me? How
many do I have left?”
Think back to when we did addition last week.
What methods can you use to help you work out the answer.
Here are some of the different methods we could have used to work it out...
=-
16 7 9
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Subtraction
16-7=9
16-7=9
4-5=
5-4=
“The answer to both these number sentences will be the same because the numbers in them are the same.”
Is Polly the Parrot right? Explain your answer.
TaskUsing objects to subtract
Examples: Pasta shells, pencils or counters.
Using your objects, can you work out the following:
5-2=10-7=12-5=15-4=11-4=19-1=
Challenge and extension See next side
Can you give these word problems a go?
If you had 12 parrots and 2 of them flew away, how many would you have left?
I saw 17 pirate ships with my telescope. Five of them had green sails and the rest were red. How many sails were red?
Salma’s pirate ship was 10 meters wide. Rick’s pirate ship was 3 meters wide. What’s the difference in size between the two ships?
Ext.
Can you write your own pirate word problems?
Answers
5-2=310-7=312-5=715-4=1111-4=719-1=18
Let’s sing and learn!
https://www.youtube.com/watch?v=pwQKugrFmJQ
Can you find five ways to make 7 using subtraction
10-3=7
7 - ?
8 - ?
Example
Starter
What do you notice?
10-3=7
7 – 0=7
8 – 1=7
9-2=7
11-4=7
12-5=7
Here are some of different the ways.
Subtracting using a number line
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Step 1:Read the number sentence: 14-7=
Step 2:Point at the first number from the number sentence, on your number line.14
Step 3:Count back the amount it says for the second number. You will need to make 7 jumps backwards.-7
Step 5:The number you have landed on is the answer.
7 6 5 4 3 2 1
How can we answer this question?
How do we know what the missing number is?
To find the missing number we need to count the amount of jumps we make before we land on 1.
Can you work it out?
How many jumps did we make?
Jumps
7-6=1
Let’s draw number lines!Task
You will be drawing your very own number lines in the playground with chalk!
If you are completing this at home, you can write your numbers on paper and place them in a line on the floor.
You will then be working out the number sentences by doing the jumps yourself! Some of the number sentences will be addition and some will be take away. Don’t forget to take notice of the symbol. (-) (+)
Your Turn
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Can you complete the following number sentences using your own number line?
10-4=8-3=19-5=20-4=18-11=16-8=
Can you create a word problem for your friend to complete using their number line?
10-4=68-3=5
19-5=1420-4=1618-11=716-8=8
Answers
Starter
Can you write your numbers from 1 to 20?
12-5=
How can we use the part whole model to work this out?
12-5=
2 3
12-2=1010-3=7
Part whole model
7
Can you use the part whole model to work out the following number sentences...You can use your counters to help you.
17-8=14-8=13-9=18-9=11-4=15-9=
Answers
17-8= 914-8= 613-9= 418-9= 911-4= 715-9= 6
Each full stack of coins equals 10.
TASK
Can you create your own word problem?
StarterCan you write your numbers to 100 in numerals?
Challenge: Can you write your numbers in multiples of twos, fives and tens?
Explain Your Reasoning!Pearl the pirate says,
‘If you take away any odd number from 20 you will always get an odd
number.’
Is she right? Explain your reasoning!
Use your whiteboards to prove it.
We will be using all the different methods we have learnt, to complete our addition and subtraction number sentences...
TASK
Let’s reflect on our subtraction learning from this week
What has been your favourite way to subtract?
What challenge have you conquered this week?
Have you learnt anything new about subtraction that you didn’t know before?
Well done for all your amazing work this week!
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