Multiplication 5
Homework Answers
1. Use rounding to estimate the answers to the following multiplications.
A 37 × 62
40 x 60 = 2400
B 28 × 68
30 x 70 = 2100
C 447 × 38
450 x 40 =
400 x 40 + 50 x 40 =
16000 + 2000 = 18000
D 271 × 32
270 x 30 =
200 x 30 + 70 x 30 =
6000 + 2100 = 8100
E 392 × 43
390 x 40 =
300 x 40 + 90 x 40 =
12000 + 3600 = 15600
F 42 × 68
40 x 70 = 2800
2. Write the totals in order from the smallest to biggest.
2100
2400
2800
8100
15600
18000
3. Now work them out.
A 37 × 62
30 x 60 = 1800
7 x 60 = 420
2 x 30 = 60
7 x 2 = 14
2294
D 271 × 32
200 x 30 = 6000
71 x 30 = 2130
200 x 2 = 400
71 x 2 = 142
8672
HSNP © Hamilton 2014
B 28 × 68
20 x 60 = 1200
8 x 60 = 480
20 x 8 = 160
8 x 8 = 64
1904
C 447 × 38
440 x 30 = 13200
7 x 30 = 210
440 x 8 = 3520
7 x 8 = 56
16986
E 392 × 43
390 x 40 = 15600
2 x 40 = 80
390 x 3 = 1170
2x3=6
16856
F 42 × 68
40 x 60 = 2400
2 x 60 = 120
40 x 8 = 320
2 x 8 = 16
2856
Simmering Term 3
Page 7
Multiplication 5
Homework Answers
4. Multiply each of these numbers by a number between 1 and 10. Try to get
an answer as close to 400 as you can. Which answer was closest?
145.4
53.78
204.8
65.46
145.4 x 3 = 436.2
53.78 x 7 = 376.46
204.8 x 2 = 408.16
65.46 x 6 = 392.76
If you have internet access, try this
Play Multiplying Fractions Millionaire game at
bit.ly/11weRjZ. Choose one team. How far
can you make it up the pyramid? Have
another try and see if you can make it all the
way to the top! This is a computer game.
Turn 1
Turn 2
Turn 3
I made it to
I made it to
I made it to
______
______
______
just right
How did you find these problems?
too hard
too easy
Page 8