Question

0
Mental Maths
1. Observe the example in the box and use the method
to multiply.
a) 45 x 101 =
b) 30 x 103 =
Find 28 x 102
Break up 102 as 100 + 2
28 x 100 = 2800 28 x 2 = 56
28 x 102 = 2800 + 56 = 2856
c) 35 x 102 =
d) 9 x 202 =
2. Observe the example in the box and use the method
to multiply.
Find 8 x 29
29 = 30-1
8 x 30 = 240 8 x 1=8
8 x 29 = 240 - 8 = 232
a) 9 x 19 =
b) 8 x 49 =
c) 7x 29 =
d) 9 x 29 =
3. a) 5000 = 50 = ?
b) 23 x 20 = ?
c) If 20 x 35 = 700, what is 20 x 36?
d) If 20 x 35 = 700, what is 21 x 36?
e) If 12 x 55 = 660, what is 6 x 55?​

Answer 1

Answer:

1. 1. 4545

2. 3090

3. 3060

Answer 2

Answer:

very very very very very long question