Share things fairly, make equal groups and find what is left over. Play, solve missions, crack puzzles and beat the clock.
Start here. Division is fair sharing. You have 12 cookies and 3 plates. Give one cookie to each plate, again and again, until the cookies run out. Every plate has 4. We write 12 ÷ 3 = 4.
Another way to see it: groups. Instead of plates, ask "how many groups of 3 can I make from 12?" You can make 4 groups. The answer is the same: 12 ÷ 3 = 4.
Division and multiplication are partners. If 3 plates with 4 cookies each make 12, then 3 × 4 = 12. So 12 ÷ 3 = 4 because 3 × 4 = 12. When you divide, you are looking for the missing factor.
Left over. Try 14 cookies on 4 plates. Each plate gets 3 and 2 cookies are left over, because there are not enough for another full round. We write 14 ÷ 4 = 3 remainder 2, or 3 r 2. Check it: 4 × 3 + 2 = 14. The left-over number is always smaller than the number of plates.
Try this above. In Play, share 12 among 3 plates, then switch to Groups. Next, set 17 items and 5 plates and find the left-over. Last, try 20 items on 4 plates and look at the array.
It means share 12 equally into 3 parts, or find how many groups of 3 are in 12. The answer is 4.
A remainder is what is left over when you cannot share equally. In 14 ÷ 4 = 3 r 2, each of 4 plates gets 3 and 2 are left over.
Multiply the answer by the number you divided by, then add the remainder. For 14 ÷ 4 = 3 r 2, check 4 × 3 + 2 = 14.
"Just starting" shares up to 20 among 2, 3, 4, 5 or 10 plates. "I know the basics" goes up to 100 and meets left-overs. "Challenge me" goes up to 144 ÷ 12 and uses two-digit numbers with remainders.
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