Counting in groups and multiplication stories
Counting in steps of 7 and 200, "times as many" stories, changing dollars into toman and speed problems with a multiplying machine.
- إيران: الصف ٣
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الدليل
When things come in equal groups we can count group by group: 7, 14, 21, 28 ... each time 7 more.
"2 times as many" means two equal groups. If Ali has 3 pencils and Sara has 2 times as many, she has 2 × 3 = 6.
The machine multiplies every input by a fixed number: dollars to toman, hours to kilometres. How many does each unit give?