Waterfall charts in Excel - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the formula to calculate the net change between two values in Excel.

Excel

=B2[1]C2

Drag options to blanks, or click blank then click option'

A+

B-

C*

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using + instead of - causes incorrect net change.

Using * or / will not calculate the difference.

The net change is calculated by subtracting the previous value from the current value, so the correct operator is -.

2fill in blank

medium

Complete the formula to calculate the cumulative total in a waterfall chart in Excel.

Excel

=SUM($B$2:B[1])

Drag options to blanks, or click blank then click option'

A3

B6

C4

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong row number causes incorrect cumulative sums.

Not fixing the start cell with $ signs breaks the formula when copied.

The formula sums from the fixed start cell B2 to the current row cell B4 to get the cumulative total.

3fill in blank

hard

Fix the error in the formula that calculates the starting point for the next bar in a waterfall chart.

Excel

=IF(B3>0, [1] + B3, [1])

Drag options to blanks, or click blank then click option'

AB2

BC2

CA2

DD2

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong column letter causes reference errors.

Using the same row instead of the previous row breaks the logic.

The formula should add the current value B3 to the previous cumulative total B2 to get the next starting point.

4fill in blank

hard

Fill both blanks to create a formula that sets the base for positive and negative changes in a waterfall chart.

Excel

=IF(B4>0, [1], [2])

Drag options to blanks, or click blank then click option'

AB3

B0

CB3 + B4

DB4

Attempts:

3 left

💡 Hint

Common Mistakes

Using the current change value as base causes wrong bar positions.

Not using zero for negative changes breaks the waterfall effect.

If the change is positive, the base is the previous total B3. If negative, the base is zero to start the drop from the baseline.

5fill in blank

hard

Fill all three blanks to create a formula that calculates the height of bars in a waterfall chart, distinguishing increases and decreases.

Excel

=IF(B5>0, [1] - [2], [3] - B5)

Drag options to blanks, or click blank then click option'

AB5

BB4

DB3

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up cell references causes incorrect bar heights.

Using the same cell for both parts breaks the formula logic.

For positive changes, subtract the previous total B4 from the current value B5. For negative changes, subtract the change B5 from the previous total B3.

Practice

1. What is the main purpose of a Waterfall chart in Excel?

easy

A. To show how an initial value changes step-by-step to a final value

B. To display data in a pie format

C. To compare values across categories side-by-side

D. To create a 3D visual effect for data

Solution

1. Step 1: Understand Waterfall chart purpose

   Waterfall charts visualize how an initial value changes through a series of positive and negative values to reach a final total.

2. Step 2: Compare with other chart types

   Pie charts show parts of a whole, bar charts compare categories, and 3D effects are visual styles, not purposes.

3. Final Answer:

   To show how an initial value changes step-by-step to a final value -> Option A

4. Quick Check:

   Waterfall charts = step-by-step changes [OK]

Hint: Waterfall = track increases and decreases stepwise [OK]

Common Mistakes:

• Confusing waterfall with pie or bar charts
• Thinking waterfall shows only totals, not changes
• Assuming waterfall charts use formulas directly

2. Which of these is the correct way to prepare data for a Waterfall chart in Excel?

easy

A. Use only positive values for all changes

B. Enter formulas directly into the chart

C. Use text labels only without numbers

D. Include both positive and negative values to show increases and decreases

Solution

1. Step 1: Identify data requirements for Waterfall charts

   Waterfall charts need positive values for increases and negative values for decreases to show step changes clearly.

2. Step 2: Eliminate incorrect options

   Using only positive values hides decreases, text labels alone don't create the chart, and formulas are not entered directly into charts.

3. Final Answer:

   Include both positive and negative values to show increases and decreases -> Option D

4. Quick Check:

   Positive and negative values = correct data setup [OK]

Hint: Use positive & negative numbers for changes [OK]

Common Mistakes:

• Using only positive numbers hides decreases
• Trying to put formulas inside the chart
• Using text without numbers for values

3. Given this data for a Waterfall chart:
Start: 100
Increase: 30
Decrease: -20
Increase: 10
What is the final total shown in the chart?

medium

A. 130

B. 120

C. 140

D. 150

Solution

1. Step 1: Add increases and decreases to start value

   Start with 100, add 30 (increase) = 130, subtract 20 (decrease) = 110, add 10 (increase) = 120.

2. Step 2: Calculate final total

   Final total after all changes is 120.

3. Final Answer:

   120 -> Option B

4. Quick Check:

   100 + 30 - 20 + 10 = 120 [OK]

Hint: Add positive and subtract negative values stepwise [OK]

Common Mistakes:

• Adding negative values instead of subtracting
• Ignoring decreases in calculation
• Mixing up order of operations

4. You created a Waterfall chart but it shows all bars starting from zero instead of connecting. What is the likely cause?

medium

A. Data does not include negative values

B. The data range is not formatted as a table

C. The 'Set as total' option is missing for subtotal rows

D. Chart type selected is not Waterfall

Solution

1. Step 1: Understand Waterfall chart bar connections

   Bars connect when Excel knows which rows are totals or subtotals, set by 'Set as total' option.

2. Step 2: Identify missing 'Set as total' setting

   If subtotal rows are not marked as totals, bars start from zero instead of continuing from previous values.

3. Final Answer:

   The 'Set as total' option is missing for subtotal rows -> Option C

4. Quick Check:

   Missing 'Set as total' = disconnected bars [OK]

Hint: Mark subtotal rows as totals to connect bars [OK]

Common Mistakes:

• Assuming negative values fix bar connections
• Thinking table format affects bar start points
• Choosing wrong chart type without checking data

5. You want to create a Waterfall chart showing monthly sales changes, but some months have zero change. How should you handle zero values to keep the chart clear?

hard

A. Leave zero values as is; Excel will show no bar for those months

B. Remove rows with zero values from the data

C. Replace zero values with small positive numbers

D. Convert zero values to negative numbers

Solution

1. Step 1: Understand zero values in Waterfall charts

   Zero values represent no change, so Excel shows no bar for those points, keeping the chart accurate and clear.

2. Step 2: Avoid altering zero values

   Replacing zeros with small positives or negatives misrepresents data; removing rows loses timeline context.

3. Final Answer:

   Leave zero values as is; Excel will show no bar for those months -> Option A

4. Quick Check:

   Zero values = no bar, keep data accurate [OK]

Hint: Keep zeros; chart shows no bar for no change [OK]

Common Mistakes:

• Changing zeros to small numbers distorts data
• Deleting zero rows breaks timeline
• Using negative numbers for zero changes