Question 2
Aussie Vaaz ice-cream stores nationwide have a variety of 15 flavours of ice-cream available for sale. Each scoop of ice-cream they serve weighs 75.5 grams. Cassandra felt extremely indulgent and asked for 3 scoops of ice-cream on her waffle cone.
How many grams of ice-cream did Cassandra have on her waffle cone?
Solution
| One scoop of ice-cream weighs 75.5 grams. |
| Cassandra had 3 scoops, therefore 3 x 75.5 grams. |
Method 1 (addition)
| We know 3 × 75.5 = 75.5 + 75.5 + 75.5 = 226.5 grams |
| or |
| 2 scoops would weigh 2 × 75.5 = 151 grams |
| 3 scoops weigh 151 + 75.5 = 226.5 grams. |
Method 2 (multiplication)
| 75.5 × 3 |
= 75 × 3 + 0.5 × 3 |
| |
= 225 + 1.5 |
| |
= 226.5 grams. |
| This suggests setting it out as follows |
| |
7151.5 |
| × |
3 |
| |
2 2 6 .5 |
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