6
Decimal subtraction
0
59
0
Find the difference between five hundred and six and fourteen point seven.
100
0
1
491.3
Well done, 506.0 - 14.7 written with decimals underneath each other
1
100
1
492.3
nope - check the units subtration, did you cross off the 6 for 5?
0
0
1
41.3
nope - check how you wrote the five hundred and six in figures, I wrote the sum as 506.0 - 14.7
0
0
1
359
nope - write the figures as 506.0 - 14.7 and line the figures in columns with the decimal points underneath each other
0
0
1
0
0
1
What is 31.26 - 1.7 ?
100
0
1
29.56
Well done, 31.26 - 1.70 written in columns
1
100
1
30.56
nope - check your subtraction in the units, did you cross off the 1?
0
0
1
31.09
nope - the sum should be written as 31.26 - 1.70 with figures underneath each other in columns
0
0
1
28.56
nope - check what you subtracted in the units column
0
0
1
0
0
1
What is 4 -1.75?
100
0
1
2.25
Well done, written as 4.00 - 1.75 in columns and you can't go wrong
1
100
1
1.75
nope - 4 minus something less that 2 must come out larger than 2. Try again
0
0
1
1.71
nope - the sum is written as 4.00 - 1.75 in columns with 4.00 on top and the decimal points in line
0
0
1
2.15
nope - check your subtraction in the first decimal place
0
0
1
0
0
1
Find 67.75 - 5.3
100
0
1
62.45
Well done, 67.75 - 5.30 in columns with the decimal points lined up
1
100
1
67.22
nope - make sure you have written the sum as 67.75 - 5.30 in columns with the decimal points lined up
0
0
1
73.05
nope - you have added, try subtracting in columns
0
0
1
14.75
nope - check you have written the sum as 67.75 - 5.30 in columns with the decimal points lined up
0
0
1
0
0
1
Find 12 - 3.75
100
0
1
8.25
Well done, 12.00 - 3.75 written in columns with the decimal points lined up, you can't go wrong
1
100
1
2.55
nope - how can roughly 12 minus 4 be so small? Write the question as 12.00 - 3.75 in columns and line the decimal points up
0
0
1
25.5
nope - how can 12 - 4 (about) be larger than 12? Write the question as 12.00 - 3.75 in columns and line the decimal points up
0
0
1
7.75
nope - try again using 12.00 - 3.75 in columns and remember to line the decimal points up
0
0
1
0
0
1
Find the difference between twenty seven point three six and sixteen point five
100
0
1
10.86
Well done, write the sum as 27.36 - 16.50 and put the numbers in columns with the decimal points lined up
1
100
1
11.86
nope - check the subtraction in the units column
0
0
1
25.71
nope - write the sum as 27.36 - 16.50 and put the numbers in columns with the decimal points lined up
0
0
1
9.86
nope - check subtraction in the units column
0
0
1
0
0
1
Find 46.2 - 13.675
100
0
1
32.525
Well done, you wrote the question as 46.200 - 13.675 and subtracted in columns with the decimal points lined up
1
100
1
13.213
nope, you have the sum the wrong way round and with the figures in the wrong columns. Write the sum as 46.200 - 13.675 with the 46.200 on top
0
0
1
32.535
nope - check your subtracting in the second decimal place
0
0
1
29.225
nope - the sum is 46.200 - 13.675 and not 42.600 - 13.675. Tell the tutor if you transpose digits often
0
0
1
0
0
1
Find 500 - 10.7
100
0
1
489.3
Well done, you wrote 500.0 - 10.7 with the figures underneath each other and the decimal points lined up
1
100
1
393
nope - write the sum as 500.0 - 10.7 with the figures underneath each other and the decimal points lined up and try again
0
0
1
498.3
nope - make sure you write the sum as 500.0 - 10.7 with the figures underneath each other and the decimal points lined up
0
0
1
499.3
nope - check the subtraction in the 10s column
0
0
1
0
0
1
Calculate the difference between four thousand and seven and seventy eight point zero four
100
0
1
3928.96
Well done, you wrote the sum as 4007.00 - 78.04 in columns with the decimal points lined up
1
100
1
3797
nope - you need to write the sum as 4007.00 - 78.04 in columns with the decimal points lined up
0
0
1
3938.96
nope - check the subtraction in the 10s column
0
0
1
3928.6
nope - check how you have written the number seventy eight point zero four. I wrote the sum as 4007.00 - 78.04
0
0
1
0
0
1
Find the difference between two point five four and two and a half
100
0
1
0.04
Well done, the sum is written as 2.54 - 2.50
1
100
1
0.49
nope - two and a half is best written as 2.50 not 2.05
0
0
1
-0.04
nope - the 'difference' between two numbers is always positive, so do the largest minus the smallest
0
0
1
1.57%
nope - the question asks for the difference not the percentage difference (but your figure is correct!)
0
0
1
0
0
1
0
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