Tamilnadu State Board New Syllabus Samacheer Kalvi 4th Maths Guide Pdf Term 3 Chapter 2 Numbers Ex 2.7 Textbook Questions and Answers, Notes.

## Tamilnadu Samacheer Kalvi 4th Maths Solutions Term 3 Chapter 2 Numbers Ex 2.7

Simplify the following multiplication facts by adding partial products.

Question 1.

9 × 42

Answer:

42 = 40 + 2

40 × 9 = 360

2 × 9 = 18

9 × 42 = 360 + 18 = 378

Question 2.

3 × 78

Answer:

78 = 70 + 8

70 × 3 = 210

8 × 3 = 24

3 × 78 = 210 + 24 = 234

Question 3.

36 × 12

Answer:

36 = 30 + 6

30 × 12 = 360

6 × 12 = 72

36 × 12 = 360 + 72 = 432

Question 4.

18 × 19

Answer:

19 = 10 + 9

10 × 18 = 180

18 × 9 = 162

180 + 162 = 342

Question 5.

68 × 31

Answer:

68 = 60 + 8

60 × 31 = 1860

8 × 31 = 248

68 × 31 = 1860 + 248 = 2108

Question 6.

42 × 21

Answer:

42 = 40 + 2

40 × 21 = 840

2 × 21 = 42

42 × 21 = 840 + 42 = 882