Question

Estimate and calculate:

S.No.	Multiplication fact	Actual value	Estimated value	Difference
1.	35 × 12	420	40 × 10 = 400	20
2.	82 × 28
3.	16 × 12
4.	23 × 27

Answer 1

S.No.	Multiplication fact	Actual value	Estimated value	Difference
1.	35 × 12	420	40 × 10 = 400	20
2.	82 × 28	2296	80 × 30 = 2400	104
3.	16 × 12	192	20 × 10 = 200	8
4.	23 × 27	621	20 × 30 = 600	21