Multiplication is commutative so 43 × 16 = 16 × 43 = 688.
Division is the inverse operation to multiplication so if 16 × 43 = 688 then 688 ÷ 16 = 43.
Multiplication is commutative so 43 × 16 = 16 × 43 = 688.
Consider the related calculations.
1.6 = 16 ÷ 10
4300 = 43 × 100
Therefore 1.6 × 4300 = (16 ÷ 10) × (43 × 100) = 16 × 43 ÷ 10 × 100.
16 × 43 ÷ 10 × 100 = 688 × 10
1.6 × 4300 = 6880
Begin by writing as a fraction and changing the denominator to an integer.
Division is the inverse operation to multiplication so if 43 × 16 = 688 then 688 ÷ 43 = 16.
68.8 ÷ 4.3 = 16
Estimate 68.8 ÷ 4.3 by rounding 68.8 to 70 and 4.3 to 5.
70 ÷ 5 = 14
This shows that 16 is likely to be correct, if we had an answer of 1.6 or 160 then we would know we are wrong.
We can estimate 68.8 ÷ 4.3 by carrying out the calculation 70 ÷ 5 = 14 in our heads and comparing our answer