Expanded vertical
Compact vertical
237 x 4 (estimate: 25
0 x 4 = 1000)
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How ma
43 x 6
(estimate:
40 x 6 = 240)
237
x 4
28 ( 7 x 4
)
120 ( 30 x 4
)
800 (200 x 4
)
948
43
x 6
258
1
Compact grid method
43 x 6 (estimate: 40 x 6 = 240)
x
40
47 x
240 + 18 = 258
18
7
40
x
n
io
it
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Repe
+3
0
0
12
5
15
5 x 3 or 3
x5
10
10
15
Also 14 x
2
as (10 x
2 and 4
x
4
2)
1410
0
21
2
8
2
+
2
4
1692
13 x 4
+5
+5
+5
Arrays
+3
+3
9
6
3
240
6
+3
1
)
0
0
0
2
=
0
4
x
0
5
:
e
t
a
36 (estim
30 1200
5 x 3 or 3 x +53
256
x 18
2048 (256 x 8)
2560 (256 x 10)
4608
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o
h
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e
m
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Gr
3
6 240
256 x 18
(estimate:
250 x 20 = 5000
)
10 x 4 =
40
3x4=1
2
3