Which is the best estimate for 19.7 × 4.9?
الشرح
Rounding 19.7 to 20 and 4.9 to 5 gives the benchmark product 20 × 5 = 100. An estimate of 25 adds the rounded operands instead of multiplying them, while 1000 is a place-value error.
Rounding 19.7 to 20 and 4.9 to 5 gives the benchmark product 20 × 5 = 100. An estimate of 25 adds the rounded operands instead of multiplying them, while 1000 is a place-value error.