Divide by 3
First check it divides evenly (digit-sum rule), then chunk through.
5712 ÷ 3 = 1904
Check first: the digit sum 15 divides by 3, so 5712 will divide exactly too.
3 into 5 goes 1, remainder 2. Then 3 into 27 goes 9 exactly.
3 into 1 does not go: write 0. Then 3 into 12 goes 4. Quotient: 1904.
Your turn
Three to try in your head — tap what you get.
1668 ÷ 3
2322 ÷ 3
1761 ÷ 3
All 36 shortcuts: the Magic Tricks library.