Intro Flashcards
1
Q
23 x 11 =
A
2
2+3
3
253
2
Q
45 x 11 =
A
4
4 + 5
5
= 495
3
Q
231 x 11 =
A
2
2 + 3
3 + 1
1
=2541
4
Q
9 x 5
A
The 10’s will be 1 - what is multiplied by 9
9x 5 Start with 4
5-1= 4
Both digits add up to 9
4 + 5= 9
= 45
5
Q
54 x 7 =
A
50 x 7 = 350
4 x 7 = 28
= 378
6
Q
432 x 3 =
A
400 x 3 = 1200
30 x 3 = 90
2 x 3 = 6
1296
7
Q
85 x 11 =
A
8
13
5
935
8
Q
77 x 11
A
7
14
7
847
9
Q
35’2. Or 35 Squared
A
Any number that ends in 5 = 25
3 x ( next highest Number)
3 x 4 = 12
1225
10
Q
65 squared or 65’2
A
5 = 25
6 x 7 = 42
4225
11
Q
85 squared
A
7225
12
Q
85 x 85
A
5 x 5 = 25
8 x 9 = 72
7225
13
Q
84 x 86
A
If the 10’s place are the same
And
The ones add up to 10
6 x 4 = 24
8x 9 = 72
7224
14
Q
53 x 57
A
5 ‘s are the same
3 + 7 = 10
Then
3 x 7 = 21
5 x 6 = 30
3021
15
Q
13 x 6
A
10 x 6. 60
3 x 6. 18
78
