6
Adding decimals
0
59
0
Add 0.56, 3 and 2.4
100
0
1
5.96
Well done, you had the decimal points underneath each other and filled in the columns
1
100
1
2.99
nope 3 is 3.00, write the numbers so the decimal points are underneath each other. I fill in the 3 and 2.4 with zeros so they become 3.00 and 2.40
0
0
1
0.83
nope - write the numbers as 0.56, 3.00 and 2.40 and put the decimal points underneath each other
0
0
1
5.60
nope - check how you have written the 2.4 in your columns, I write it as 2.40
0
0
1
0
0
1
Add 7.6, 14 and 0.37
100
0
1
21.97
Well done, decimal points underneath each other and I write the numbers with 2 dp each, like 7.60 + 14.00 + 0.37
1
100
1
8.11
nope - check where the decimal point goes after the 14. I write it as 14.00
0
0
1
127
nope - write the sum in columns with the decimal points lined up, like 7.60 + 14.00 + 0.37
0
0
1
21.37
nope - write the 7.6 as 7.60 not 7.06
0
0
1
0
0
1
Add 1.4, 13.62 and 5
100
0
1
20.02
Well done, 1.40 + 13.62 + 5.00 with the decimal points underneath each other
1
100
1
15.07
nope - write the numbers like 1.40 + 13.62 + 5.00 and then put them in columns with the decimal points lined up
0
0
1
13.81
nope - write the numbers like 1.40 + 13.62 + 5.00 and then put them in columns with the decimal points lined up
0
0
1
19.12
nope - check that you carried the 10s correctly
0
0
1
0
0
1
Add 4, 0.05 and 0.3
100
0
1
4.35
Well done, write as 4.00 + 0.05 + 0.30 in columns and you can't go wrong
1
100
1
12
nope - write as 4.00 + 0.05 + 0.30 and then write in columns with the decimal points underneath each other
0
0
1
0.39
nope - have you written 4 as 4.00? Are the numbers written in columns with the decimal points lined up?
0
0
1
4.07
nope - write the numbers as 4.00 + 0.05 + 0.30 and then add up the numbers in columns
0
0
1
0
0
1
Add 0.375, 5 and 0.25
100
0
1
5.675
Well done - write as 0.375 + 5.000 + 0.250 and add in columns
1
100
1
5.400
nope - check that you wrote 0.25 as 0.250 and not 0.025
0
0
1
4.05
nope - write the numbers as 0.375 + 5.000 + 0.250 with the decimal points underneath each other and add in columns
0
0
1
5.725
nope - check the adding in the second column!
0
0
1
0
0
1
Add 4, 1.6 and 6.95
100
0
1
12.55
Well done, write as 4.00, 1.60 and 6.95, put in columns lined up by the decimal point and add
1
100
1
7.15
nope - check which column you put the 4 in, I write the sum as 4.00 + 1.60 + 6.95
0
0
1
8.59
nope - I write the sum as 4.00 + 1.60 + 6.95 with the numbers written in 3 columns
0
0
1
12.65
nope - check the addition in the 3rd column
0
0
1
0
0
1
Add sixteen, twenty seven and four point six
100
0
1
47.6
Well done, I write the numbers as 16.0 + 27.0 + 4.6 with the decimal points in the same column
1
100
1
89
nope - I write the numbers as 16.0 + 27.0 + 4.6 and then add in columns
0
0
1
49.6
nope - check the adding in the units column
0
0
1
79
nope - I write the numbers as 16.0 + 27.0 + 4.6 and then add in columns
0
0
1
0
0
1
Add four hundred and six, two point seven and seventeen
100
0
1
425.7
Well done, I wrote the numbers as 406.0 + 2.7 + 17.0 in columns and added
1
100
1
504
nope - write the numbers as 406.0 + 2.7 + 17.0 in columns with the decimal points lined up
0
0
1
450
nope - check that you have written the numbers as 406.0 + 2.7 + 17.0
0
0
1
415.7
nope - check the carry in the 10s column
0
0
1
0
0
1
Add 0.65, 4 and 17.1
100
0
1
21.75
Well done, numbers written as 0.65 + 4.00 + 17.10 and added in columns
1
100
1
240
nope - write the numbers as 0.65 + 4.00 + 17.10 and add in columns with the decimal points underneath each other
0
0
1
21.66
nope - how did you write the 17.1 in columns? I wrote the numbers as 0.65 + 4.00 + 17.10
0
0
1
2.40
nope - write the numbers as 0.65 + 4.00 + 17.10. 17.1 is a lot bigger than 2.4 on its own
0
0
1
0
0
1
Add 5, 4.264 and 0.36
100
0
1
9.624
Well done, write the numbers as 5.000 + 4.264 + 0.360 and add in columns
1
100
1
4.305
nope - check that you have written the numbers like 5.000 + 4.264 + 0.360 then add in columns with the decimal points lined up
0
0
1
9.3
nope - check that you have written the numbers like 5.000 + 4.264 + 0.360. Is the 0.360 in the right columns?
0
0
1
4.629
nope - check that you have written the numbers like 5.000 + 4.264 + 0.360, so 5 is 5.000!
0
0
1
0
0
1
0
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