Question:

Name Set A pages 129-132 TOP 4 Use place-value strategies to find 20 X 80. Think about the pattern. Remember when the product of

Name
Set A pages 129-132
TOP
4
Use place-value strategies to find 20 X 80.
Think about the pattern.
Remember when the
product of a basic fact has
a zero, there is one more
zero in the answer.
Reteaching
20 x 80 = 2 tens x 8 tens
= 16 hundreds
= 1,600
Use a pattern to find each product.
1. 40 x 10
2. 60 x 20
3. 80 x 50
4. 30 x 90
50 x 40 = (5 x 10) (4 x 10)
= (5 x 4) (10 x 10)
= 20 x 100
= 2,000
5. 80 x 70
6. 60 x 60
7. 80 x 30
8. 20 x 50
Set B pages 133-136
Use an array or an area model to multiply
Remember you can draw arrays or area
models to represent multiplication problems.
Draw a model to find each product.
20 x 14.
+ 20 groups of
10 = 200
1. 10 x 23
2. 16 x 20
+ 20 groups of
4 = 80
200 + 80 = 280
So, 20 x 14 = 280.
Set Cpages 137-140
Use compatible numbers to estimate
28 x 19.
Remember that compatible numbers are
numbers that are easy to compute with
mentally
Estimate each product.
28 is close to 25.
19 is close to 20.
1. 29 x 31
2. 42 x 49
If 25 x 2 = 50, then
25 x 20 = 500.
3. 73 x 18
4. 24 x 38
So, 28 x 19 is about 500.
6. 63 x 87
5. 19 x 31
Topic 4 Reteaching

Name Set A pages 129-132 TOP 4 Use place-value strategies to find 20 X 80. Think about the pattern. Remember when the product of a basic fact has a zero, there is one more zero in the answer. Reteaching 20 x 80 = 2 tens x 8 tens = 16 hundreds = 1,600 Use a pattern to find each product. 1. 40 x 10 2. 60 x 20 3. 80 x 50 4. 30 x 90 50 x 40 = (5 x 10) (4 x 10) = (5 x 4) (10 x 10) = 20 x 100 = 2,000 5. 80 x 70 6. 60 x 60 7. 80 x 30 8. 20 x 50 Set B pages 133-136 Use an array or an area model to multiply Remember you can draw arrays or area models to represent multiplication problems. Draw a model to find each product. 20 x 14. + 20 groups of 10 = 200 1. 10 x 23 2. 16 x 20 + 20 groups of 4 = 80 200 + 80 = 280 So, 20 x 14 = 280. Set Cpages 137-140 Use compatible numbers to estimate 28 x 19. Remember that compatible numbers are numbers that are easy to compute with mentally Estimate each product. 28 is close to 25. 19 is close to 20. 1. 29 x 31 2. 42 x 49 If 25 x 2 = 50, then 25 x 20 = 500. 3. 73 x 18 4. 24 x 38 So, 28 x 19 is about 500. 6. 63 x 87 5. 19 x 31 Topic 4 Reteaching

Answer

4oxio = 4 tens x itens
(4x 10) XCIXIO)
- 4XLX CLOXO)
4 x 100 = 400
60x2a- (6810)(2010)
- 46X2J x Como)
12 X 100
1200
soxso
(8410) X (SX10% = (8xS) XC 10x10)
40 X 100
= 40,00
%3D
s
35 x 90
(3x10) x (axlo)
13x9x Cloxio)
27 X 100 C2700
sox 70
= 18x10) x (x10=18x 71 x Cloxo)
568 1.00 5,600
60x60
= 16 x 10) XC6X102 - 16X GX(10X10]
- (
6
36 x 100
7.
80x30 = (8x10 ) X (3210)
(8x3) x (loxiol
24 X loo
20vso
e x 100 x CS 410) = (2x8) X (10x10l
10X1oo.
10oo
240

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4oxio = 4 tens x itens (4x 10) XCIXIO) - 4XLX CLOXO) 4 x 100 = 400 60x2a- (6810)(2010) - 46X2J x Como) 12 X 100 12... Download the app for the rest