STILLWATER CROSSING · THE COURSE NOTES · BRIDGE MATH 5/6

Week 12 · Reading Rulers and Multiplying Fractions

This week

Lessons 56, 57, 58, 59 & 60

Papers

Test 6 to do at home · Escape Room 3 opens

Method

No calculators, ever · show every step

Instructional notes

Label the ruler.

116

316

516

716

916

1116

1316

1516

Example

1 Use your ruler to measure each line to the nearest inch. 16 *Measurements may be slightly off due to variations in printers*

3 3 in. 8

Practice

1 Use your ruler to measure each line to the nearest inch. 16

1 3 in. 4

9 5 in. 16

Use your ruler to draw a line to these lengths. *Check student lines*

11 2 16

3 6 8

Instructional notes

Multiplying Fractions

To multiply fractions: • Multiply straight across • No common denominators needed • Simplify

Example

Multiply.

3 7 3 × 7 21 21 ÷21 1 × = = = =

x = = = 11 2 22 11 ÷2 11

Practice

Multiply. 2 5 1 2 9 3 × = x = 5 8 4 3 10 5

3 8 1 3 8 × = x =1 4 12 2 4 6

Instructional notes

Simplify before you multiply, if possible, through cancellation. This allows us to avoid multiplying large numbers.

To cancel before multiplying fractions: • Identify the GCF for a numerator and a denominator • Divide by the GCF • Repeat if able • Multiply straight across

Example

Multiply using cancellation.

x = = x = =

Practice

3 2 3 8 6 4 x = x = 4 5 10 9 28 21

9 16 1 2 5 9 3 x = x x = 16 54 6 3 10 25 25

Quick Review

Sarah began reading her new book at 5:45 p.m. and finished at 10:02 p.m. How long did it take her to read the book? If Sarah must go to bed at 11:35 p.m., how much free time does she have before bed?

10:02 - 5:45 = 4:17 11:35 - 10:02 = 1:33

✍ In your own words

explain how knowing the divisibility rules can help when multiplying fractions. Suggested Answer: Knowing divisibility rules lets you simplify fractions before multiplying, making calculations smaller and faster. Instead of multiplying large numbers and reducing at the end, you can use cancellation, so you multiply with much simpler numbers.

Homework this week

Work-text	Lesson 56	Lesson 57	Lesson 58	Lesson 59	Lesson 60
Speed drill	56	57	58	60

Terms on the record

Term	Meaning
multiplying fractions	To multiply fractions:

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