Chapter 2 Our Number System, Addition And Subtraction Examples And Worksheet Page 20
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3052
OUR NUMBER SYSTEM, ADDITION AND SUBTRACTION (CHAPTER 2)
Hundreds
Tens
Ones
Notice the trading
of 100 for ten 10’s,
5000
and 10 for ten 1’s.
-
327
So, our working looks like this:
DEMO
9
4
10
4
10
10
5
0 0
5
0
0
then
¡ 3
2 7
¡ 3
2
7
1
7
3
You can always check
subtractions by adding.
Here 327 + 173 should
add to 500.
EXERCISE 2G
1
Find these subtractions.
200
300
300
a
b
c
¡ 57
¡ 126
¡ 241
400
400
400
d
e
f
¡ 68
¡ 172
¡ 258
500
600
700
g
h
i
¡ 139
¡ 322
¡ 431
We could do this: 700 ¡ 431 = 699 ¡ 431
+ 1
2
|
{z
}
easy to do
Use this idea to redo question
1
parts
f
to
j
.
3
Find
232 ¡ 117
372 ¡ 164
462 ¡ 238
a
b
c
518 ¡ 232
629 ¡ 376
418 ¡ 159
d
e
f
361 ¡ 278
513 ¡ 367
626 ¡ 449
g
h
i
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