Multiplying Lower Numbers 63
Test you rself
Tr y the se :
a) 8 × 5 =
b) 4 × 5 =
c) 2 × 5 =
d) 6 × 5 =
The answers are:
a) 40 b) 20 c) 10 d) 30
Th is is what we do when the tens digit is odd. Let’s try 7 × 5. First
multiply by 10:
7 × 10 = 70
If you fi nd it diffi cult to halve the 70, split it into 60 + 10. Half of
60 is 30 and half of 10 is 5, which gives us 35.
Let’s try another:
9 × 5 =
Ten nines are 90. Ninety splits to 80 + 10. Half of 80 + 10 is 40 +
5, so our answer is 45.
Test you rself
Try these for yourself:
a) 3 × 5 =
b) 5 × 5 =
c) 9 × 5 =
d) 7 × 5 =
brent
(Brent)
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