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Addition and Subtraction (Year 6)
2.78 + 0.22 = 3

Addition and Subtraction (Year 6)

In Year 6, which is the fourth year in KS2 Maths and just before secondary school, you'll tackle tricky addition and subtraction problems. You'll learn words like altogether, difference, increase, and decrease.

Knowing how to add and subtract is super useful in everyday life, like when counting things in a shop. Imagine a bakery with 100 iced buns, selling 60 by lunch. If someone wants 38 buns in the afternoon, the baker must figure out if there are enough left. It's like solving puzzles!

You might use these skills to find out when your grandma was born. If she's 60, subtract that from the current year for the answer. Try a fun Year 6 quiz to test your addition and subtraction knowledge!

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1 .
Increase 450 by 230.
220
280
580
680
Increase means get larger so we add the numbers
2 .
Which of these pairs would not make a whole number?
2.78 + 0.22
3.54 + 2.46
5.01 + 1.9
4.97 + 2.03
5.1 + 1.9 = 7 but 5.01 + 1.9 = 6.91 which is not a whole number
3 .
What is the best method of adding 34 + 48 + 56?
Find the pair that total a multiple of 100 - add these first
Find the pair that total a multiple of 10 - add these first
Add 10s first then the ones
Double 34 then adjust
34 + 56 = 90 which is a multiple of 10 now add 48 so 90 + 48 = 138
4 .
Which strategy would be best to subtract 2.9?
Add 3 subtract 1
Subtract 3 add 0.1
Subtract 3 subtract 0.1
Subtract 3 add 1
e.g. 3.4 - 2.9:
3.4 - 3 = 0.4
0.4 + 0.1 = 0.5
so 3.4 - 2.9 = 0.5
5 .
Which strategy would be best to add 69 + 61 + 65 + 67?
(60 x 4) + (1 + 5 + 7 + 9)
(70 x 4) - (1 + 5 + 7 + 9)
(61 + 65) + (67 + 69)
(60 x 4) - (1 + 5 + 7 + 9)
60 x 4 = 240 and 1 + 5 + 7 + 9 = 22
240 + 22 = 262
6 .
What is the difference between 6.3 and 2.4?
2.9
3.9
4
4.1
Difference means take the smaller number away from the larger
7 .
What is the best method of adding 0.9?
Add 1 subtract 1
Add 1 add 0.1
Subtract 1 subtract 0.1
Add 1 subtract 0.1
e.g. 1.3 + 0.9:
1.3 + 1 = 2.3
2.3 - 0.1 = 2.2
so 1.3 + 0.9 = 2.2
8 .
Decrease 2.5 by 1.8.
0.6
0.7
1.7
4.3
Decrease means get smaller so we subtract the numbers
9 .
Which of these number sentences is incorrect?
2.56 + 3.41 = 5.97
5.97 - 3.41 = 2.56
5.97 - 2.56 = 3.41
3.41 - 2.56 = 5.97
3.41 - 2.56 = 0.85
10 .
How many altogether are 258 and 162?
320
400
420
450
One way to work this out is to add the ones: 2 + 8 = 10
then the tens: 50 + 60 = 110
then the hundreds: 200 + 100 = 300
then add them all together: 300 + 110 + 10 = 420
You can find more about this topic by visiting BBC Bitesize - Adding and subtracting

Author:  Amanda Swift
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