6.1 Repeated Addition You should know by know that multiplication is also repeated addition. 3 · 4 = 4 + 4 + 4 = 12 If you multiply a whole number with a decimal number, you do so in exactly the same manner.
3 · 0.8 = 0.8 + 0.8 + 0.8 = 2.4
Here is an everyday example: Mirjam runs four days a week. Every practice she runs 0.5 mil (Swedish mil = 10 kilometers). How far has she run during one week? 0.5 mil + 0.5 mil + 0.5 mil + 0.5 mil = 4 · 0.5 mil = 2 mil