This chart shows the Number Sum and Root Sum. The Number Sum is the sum of calculating the numbers in a combination of a draw result and reduce it to a single digit called "root sum". E.g., a combination of numbers 7, 8, 5, 3, 2, and 1 has a sum of 26. The root sum is 2+6 = 8. If the root sum is more than 1 digit, the root sum is computed again. Analyzing these values over time can sometimes reveal trends in sum totals that appear more frequently.

Last 75 draws
From Jul. 2, 2024 To Dec. 2, 2025

Number Sum Frequency

The graph below illustrates the trends of both the number sum and the root sum over 75 draws, from Jul. 2, 2024 to Dec. 2, 2025 . The Number Sum is the sum of the number combination, obtained by adding together all the numbers selected in a draw, while the Root Sum is derived by reducing the number sum to a single-digit value. Each point on the chart represents the respective values for a single draw, allowing for a clear visual comparison of how these two metrics fluctuate over time. Together, these lines help highlight any emerging patterns, anomalies, or correlations between the overall sum of numbers and their root values throughout the analyzed period.

Number Sum
Root Sum

Number Sum Histogram

The histogram of sums below is a statistical representation that illustrates how often different total values of lotto number combinations occur across 75 draws, from Jul. 2, 2024 to Dec. 2, 2025 . In lotto analysis, studying the distribution of sums helps identify whether draws tend to favor lower totals, higher totals, or mid-range totals, providing a clearer view of number spread patterns.

The possible range of sums is divided into bins or categories. In this case, the bins are defined as intervals such as 28-62 up to 273-308, each representing a continuous span of total values.

This division is important because lotto sums can vary widely, and grouping them into bins makes it easier to detect trends. For example, a cluster of sums in the middle intervals may suggest that draws are balanced between small and large numbers, while dominance in extreme bins could indicate a bias toward unusually low or high totals.

The histogram of sums provides useful insights into the overall totals of lotto draws. The most common sum range is 168-202 with 28 occurrences, indicating that many draws fall within this total range. Conversely, the least common sum range is 28-62, 63-97, 273-308 with 0 occurrences, showing that relatively few draws produce totals in this span. This suggests a noticeable concentration of draws within certain total ranges.

In summary, the distribution of sums shows clustering around specific total ranges, suggesting that draws tend to gravitate toward these totals.

Root Sum Histogram

The histogram of root sums above below provides a way to visualize how lotto combinations across 75 draws, from Jul. 2, 2024 to Dec. 2, 2025 , behave when their sums are repeatedly reduced to a single-digit value (from 1 to 9), also called the digital root. This is often used to uncover hidden numerical patterns and balance among draws, since different number combinations can collapse into the same single-digit outcome.

The histogram divides the results into categories from 1 through 9, naturally, with each bin representing one root sum. By observing which categories are more or less frequent, analysts can quickly identify whether certain root sums dominate the outcomes or whether the distribution is fairly even.

The histogram of root sums, where digits of totals are repeatedly reduced to a single digit reveals that the most frequent root sum category is 7 with 11 occurrences, suggesting a strong clustering in this interval. In contrast, the least frequent root sum category is 0 with 0 occurrences, showing it is rarely observed. Some root sum categorys are significantly underrepresented compared to the average. Overall, the distribution shows clustering around specific root sum categorys, indicating that draws tend to gravitate toward these values.

Number Sum and Root Sum Statistical Analysis

The lottery number sum distribution reveals a total of 75 draws, from Jul. 2, 2024 to Dec. 2, 2025 , spanning 57 unique sum values. The weighted average sum is approximately 172.69, with a standard deviation of about 32.84.

The frequency of occurrences ranges from 1 to 3 draws for individual sums. For the root sum distribution, there are 75 unique root values with a total of 397 occurrences. The weighted average root sum is 36.17, with a standard deviation of 22.47. Frequencies range from 1 to 9 draws per root value.

The number sum distribution is uneven, with some values appearing significantly more often than others. The root sum distribution is uneven, with some values appearing significantly more often than others.

Format Changes in Australia's Oz Lotto

Oz Lotto, Australia’s first national lottery, has undergone several format changes since its launch in 1994. Below is the timeline of the Australia's Oz lotto format changes:

Period Format Supplementary Nos.
1994 - Oct. 11, 2005 6 numbers from a pool of 45 (6/45) 2 numbers from the same pool.
Oct. 18, 2005 - May 10, 2022 7 numbers from a pool of 45 (7/45) 2 number from the same pool.
May 17, 2022 - Present 7 numbers from a pool of 47 (7/47) 3 number from the same pool

Initially, the game required players to select six numbers from a pool of 45, and two supplementary numbers were drawn to help determine secondary prizes. In October 2005, the format was modified to increase the number of main numbers drawn from six to seven, still from a pool of 45, while retaining two supplementary numbers. This change made the jackpot more difficult to win but allowed for larger prize pools. In May 2022, Oz Lotto underwent another significant update. The number pool was increased from 45 to 47, while the game continued to draw seven main numbers. Additionally, the number of supplementary numbers increased from two to three. Along with this change, the minimum jackpot prize was raised from $2 million to $3 million, and the overall odds of winning any prize improved, creating more opportunities for players to win across additional prize divisions. These changes reflect Oz Lotto's ongoing efforts to remain engaging and competitive within Australia’s lottery landscape.

How Australia's Oz Lotto Format Changes Affect Your Number Strategy.

These format changes have a direct impact on statistical analysis. Mixing frequency data across different formats is not advisable because each version of the game has a different number pool and probability structure.

For example, a number that appeared frequently in the 6/45 format may have done so due to higher individual draw probability, but that same frequency can be misleading in the 7/45 or 7/47 formats. Furthermore, changes to the number pool also significantly affect how often a specific supplementary numbers appear.

Therefore, for meaningful analysis, it’s essential to treat each format as its own distinct dataset. Analyzing trends or frequencies should be restricted to results from within the same format period, especially if the goal is to inform number selection in the current game structure.