Homework sheet
1D: Subtraction
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2
3
4
Mentally subtract 9 from each number by first subtracting 10, then adding 1.
a
28
b 201
c 441
d
1008
e 3902
f 4002
Mentally subtract 37 from each number by first subtracting 40, then adding 3.
a
83
b 62
c 191
d
304
e 1000
f 1385
Mentally subtract 186 from each number by first subtracting 200, then adding 14.
a
201
b 562
c 1043
d
4958
e 2109
f 3008
Carry out these subtractions mentally by counting on from the smaller number to the
larger number.
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6
a
145 – 80
b
227 – 145
c
301 – 268
d
614 – 465
Subtract the tens first, then the units, to perform these calculations mentally.
a
198 – 72
b
304 – 81
c
213 – 64
d
444 – 97
Carry out each of these subtractions using the written algorithm.
a
198 – 139
b
491 – 294
c
2249 – 1982
d
7938 – 3857
e
86 387 – 57 894
f
210 907 – 198 386
7
Subtract six hundred and thirty-five from one thousand two hundred and twenty-four.
8
What is the difference between 21 095 and 43 882?
ICE-EM Year 7 Chapter 1
© Australian Mathematical Sciences Institute 2012
1
9
Hannah’s house cost $189 950 when she bought it in 2003. She sold it for $311 800 two
years later. How much profit did she make?
10 Joseph has 2342 more marbles than Lachlan. Joseph has 11 434 marbles. How many does
Lachlan have?
ICE-EM Year 7 Chapter 1
© Australian Mathematical Sciences Institute 2012
2