Welcome to your maths lessons this week! This week we’re going to re-visit and revise addition and subtraction. We will check our written methods are secure and accurate for arithmetic and then that we can apply that knowledge in reasoning and problem solving. Hope you enjoy it …
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Welcome to your maths lessons this week!
This week we’re going to re-visit and revise addition and subtraction.
We will check our written methods are secure and
accurate for arithmetic and then that we can apply that knowledge
in reasoning and problem solving.
Hope you enjoy it …
Warm up
4Challenge
17 Extra challenge
224
Double it Treble it 3/7 of it
x 8 + 24 + 168
+ 11 Third of it ÷ 8
- 3 x 5 Treble it
÷ 9 - 29 + 93
Halve it 2/3 of it Double it
x 5 ÷ 8 - 259
- 11 + 49 20% of it
x 3 Third of it x 13
Answer = Answer = Answer =
Warm up
4Challenge
17 Extra challenge
224
Double it Treble it 3/7 of it
x 8 + 24 + 168
+ 11 Third of it ÷ 8
- 3 x 5 Treble it
÷ 9 - 29 + 93
Halve it 2/3 of it Double it
x 5 ÷ 8 - 259
- 11 + 49 20% of it
x 3 Third of it x 13
Answer = 27 Answer = 19 Answer = 325
QFL: Can I use an efficient method for addition?
QFL: Can I use an efficient method for addition?
Questions to think about …
Is the column method always the best method?
When should we use mental methods?
What happens when there is
more than 9 in a place value column?
Can I make an exchange between columns?
Which methods would you use to solve
these calculations? Mental or written?
Can you solve them?
345 + 10 =
1818 + 70 =
5813 + 1359 =
826 = 800 + ? + 6 =
? = 6000 + 90 =
53689 + 8014 =
QFL: Can I use an efficient method for addition?
345 + 10 = 355
1818 + 70 = 1888
5813 + 1359 = 7172
826 = 800 + ? + 6 = 20
? = 6000 + 90 = 6090
53,689 + 8014 = 61,703
ANSWERS
Let’s remind ourselves of how we use the
column method for addition
4 6
8+• Put the numbers into a column
• Put the higher value number at the top
• Line up the lower number so it is in the correct
place value columns
• Add the units first and then work from right to left
• If you need to exchange between columns place
your 1 underneath the bottom line
11
7
5
3
32,461 + 4852 = 37,3133 2 1
24
331
Complete the following:
A) 395 + 316 =
B) 4731 + 721 =
C) 1987 + 634 =
D) 5871 + 8992 =
E) 66,867 + 8749 =
F) 95,907 + 5363 =
G) 48,276 + 52,613 =
H) 76,387 + 49,654 =
Complete the following:
A) 395 + 316 = 711
B) 4731 + 721 = 5452
C) 1987 + 634 = 2,621
D) 5871 + 8992 = 14,863
E) 66,867 + 8749 = 75,616
F) 95,907 + 5363 = 101,270
G) 48,276 + 52,613 =100,889
H) 76,387 + 49,654 =126,041
ANSWERS
B
A
C
ANSWERS
749115,02814,441
18,480
C
B
A
QFL: Can I use an efficient method for subtraction?
Starter
Starter
ANSWERS
795
93
QFL: Can I use an efficient method for subtraction?
Questions to think about …
Should I use a written or mental method?
Does it matter which number goes on top?
What do I need to think about when setting out my work?
Will I have to exchange between columns?
Which methods would you use to solve
these calculations? Mental or written?
Can you solve them?
545 - 30 =
7913 - 1359 =
2898 - 70 =
? = 3000 - 50
53689 - 8014 =
QFL: Can I use an efficient method for subtraction?
ANSWERS545 - 30 = 515
7913 - 1359 = 6554
2898 - 70 = 2828
? = 3000 - 50 = 2950
53689 - 8014 = 45,675
Let’s remind ourselves of how we use the
column method for subtraction
0 5
1-• Put the numbers into a column
• Put the higher value number at the top
• Line up the lower number so it is in the correct
place value columns
• Subtract the units first and then work from right to
left
• If you need to exchange between columns cross
out the number you’ve exchanged from, replace it with the new number and carry the 1 back
2
1
8
2
9
131,056 – 2,128= 28,9283 1 6
82
82
402 1
Complete the following:
A) 345 - 60 =
B) 7064 - 502 =
C) 4648 - 2847 =
D) 80345 - 4219 =
E) 45,536 - 8427 =
F) 234,897 – 45,996 =
G) 834,501 – 299,999 =
H) 122,456 + 11,999 =
Complete the following:ANSWERS
A) 345 - 60 = 285
B) 7064 - 502 = 6562
C) 4648 - 2847 = 1801
D) 80345 - 4219 = 76,126
E) 45,536 - 8427 = 37,109
F) 234,897 – 45,996 = 188,901
G) 834,501 – 299,999 = 534,502
H) 122,456 - 11,999 = 110,457
Fill in the missing digits
What’s the total of the
numbers of people living in
Telford and Formby?
What’s the difference in the
number of people living in
Bedford and in Dover?
Fill in the missing digits
What’s the total of the
numbers of people living in Telford and Formby? 191,118
What’s the difference in the
number of people living in Bedford and in Dover? 48,361
ANSWERS
14
2
6 8
6
QFL: Can I add and subtract decimals ?
Complete the following calculations mentally:
A) 4.2 + 5.01 =
B) 9.7 + 0.3 =
C) 44.12 + 0.4 =
D) 1.11 + 0.9 =
E) 6.77 + 3.02 =
F) 10.8 + 1.3 =
G) 56.42 + 0.5 =
H) 0.006 + 2.1 =
*You may use jottings
Complete the following calculations mentally:
A) 4.2 + 5.01 = 9.21
B) 9.7 + 0.3 = 10
C) 44.12 + 0.4 = 44.52
D) 1.11 + 0.9 = 2.01
E) 6.77 + 3.02 = 9.79
F) 10.8 + 1.3 = 12.1
G) 56.42 + 0.5 = 56.92
H) 0.006 + 2.1 = 2.106
ANSWERS
Adding and subtracting decimalsDon’t panic ! It’s only a decimal point …
With written methods, you need to make sure you line up the different place values.
The decimal point will also need to be lined up.
Which calculation is correct? Explain why.
+ 49.24345.6
+ 49.24345.6
Show Answers
Hide Answers
The matching place values and
decimal point are lined up.
The matching place values and
decimal point are not lined up.
✔ x
Using a zero as a place value holderSometimes it is helpful to place a zero where a digit is not given.
+ 49.24 + 49.24_
- 49.24
345.6
It is more useful with subtraction.
345.60
345.6- 49.24
_
345.60
Calculate the answers to these using a written method.
Make sure you line up the decimal points.
Use a zero as a place value holder if it helps
Show Answers
Hide Answers
278 + 87.5 =
703 - 27.7 =
64 + 287.2 =
23.87 + 198.5 =
516.4 - 67.39 =
23.01 - 8.3 =
323.47 + 298.2 =
832.19 - 287.4 =
9023.7 - 298.53 =
492.78 + 3987.59 =
365.5
675.3
351.2
222.37
14.71
621.67
544.79
8725.17
449.01 4480.37
What is the difference in price between the most expensive and least expensive sunglasses!
A
B
D
C
What is the
difference in
price between
the most
expensive and
least expensive sunglasses?ANSWERS
B
A
D
C
£7.55
£22.40
£0.55 or 55p
£2.02
£2.86
QFL: Can I use my knowledge of inverse to problem solve?
Use these emojis to break the code and calculate the answer
A)
F)
E)
D)
C)
B)
Use these emojis to break the code and calculate the answer
ANSWERS
A)
F)
E)
D)
C)
B)
Let’s think back to when we did multiplication and