Page 109 - Math;Steps 3a: resource masters
P. 109
RM108
• Subtraction 0-100 (2) • • 30:30
rn Work out the answers to these in your head:
a b c
subtract 20 - 40 - 30
43 - ...•.•23 61 - .......•.·21 •
37----... -~. 13 •
- .......•.•5
51 •
77- ...•. -~. 2q •
2q- ...•. - .......•.·32 •
32-~· -~46
44 ----.. -~. 54
85-~· - .......•.·60
00 Continue these patterns. Work them out in your head.
d e f
Stop when Stop when Stop when
you reach 87. you reach 2. you have to.
87 - 80 = 7 72 - 20 = 52 q3 - 80 = 13
87 -70 = 17 62 - 20 = 42 83 -70 = 13
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I Subtracting mentally two-digit numbers from multiples
Name of 10, up to 100 at least.
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