Grade 4 - Progress in Mathematics

Measure the length of each segment.

Look for a pattern.

Cut a 45-cm string and use it to measure

the spiral. Check the addition.

Visualize the facts of the

problem as you reread it.

Facts: The spiral has 4 line segments.

The spiral will have 5 more.

Question: How long is the spiral?

Tyrell draws a spiral on grid paper.

He draws 4 line segments. Then he

draws 5 more line segments to

continue and finish the pattern.

How long is the spiral?

Problem-Solving Strategy:

Find a Pattern

10-12

Add to find the total length. Look for

sums of ten.

The spiral is 45 cm long.

1 
 2 
 3 
 4 
 5 
 6 
 7 
 8 
 9  45

1 cm 4 cm

3 cm

2 cm

1 cm 
1 cm 
1 cm

1 cm, 2 cm, 3 cm, 4 cm,...

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