17 August 2021

• 15:3815:38, 17 August 2021 diff hist +2 2019 AMC 10B Problems/Problem 2 →Solution
• 15:3715:37, 17 August 2021 diff hist +11 2019 AMC 10B Problems/Problem 1 →Solution 2

9 August 2021

• 11:4911:49, 9 August 2021 diff hist +7 2018 AMC 10A Problems/Problem 19 →Solution 3
• 11:4611:46, 9 August 2021 diff hist +1 2018 AMC 10A Problems/Problem 18 →Solution 9
• 11:4611:46, 9 August 2021 diff hist −1 2018 AMC 10A Problems/Problem 18 →Solution 9
• 11:4511:45, 9 August 2021 diff hist −2 2018 AMC 10A Problems/Problem 18 →Solution 9
• 11:3411:34, 9 August 2021 diff hist +1 2018 AMC 10A Problems/Problem 17 →Solution 1
• 11:3311:33, 9 August 2021 diff hist −26 2018 AMC 10A Problems/Problem 17 →Solution 2
• 11:3211:32, 9 August 2021 diff hist +100 2018 AMC 10A Problems/Problem 17 →Solution 2

6 August 2021

• 19:3619:36, 6 August 2021 diff hist +53 2018 AMC 10A Problems/Problem 16 →Solution 2 - Circles
• 19:3419:34, 6 August 2021 diff hist +9 2018 AMC 10A Problems/Problem 16 →Solution 1
• 17:3717:37, 6 August 2021 diff hist +5 2018 AMC 10A Problems/Problem 13 →Solution 2 (Draw it, not recommended)
• 17:2817:28, 6 August 2021 diff hist −3 2018 AMC 10A Problems/Problem 12 →Solution 3 (Casework)
• 17:0517:05, 6 August 2021 diff hist +1 2018 AMC 10A Problems/Problem 11 →Solution 1
• 17:0417:04, 6 August 2021 diff hist +1 2018 AMC 10A Problems/Problem 11 →Solution 2
• 17:0417:04, 6 August 2021 diff hist +13 2018 AMC 10A Problems/Problem 11 →Solution 2
• 17:0217:02, 6 August 2021 diff hist +13 2018 AMC 10A Problems/Problem 11 →Solution 1
• 17:0117:01, 6 August 2021 diff hist +78 2018 AMC 10A Problems/Problem 11 →Solution 1
• 16:5816:58, 6 August 2021 diff hist −6 2018 AMC 10A Problems/Problem 10 →Solution 6 (Symmetric Substitution)
• 16:5816:58, 6 August 2021 diff hist 0 2018 AMC 10A Problems/Problem 10 →Solution 5 (No Square Roots, Fastest)
• 16:5716:57, 6 August 2021 diff hist 0 2018 AMC 10A Problems/Problem 10 →Solution 1
• 13:3813:38, 6 August 2021 diff hist +18 2018 AMC 10A Problems/Problem 9 →Solution 2
• 13:3813:38, 6 August 2021 diff hist +29 2018 AMC 10A Problems/Problem 9 →Solution 2
• 13:3713:37, 6 August 2021 diff hist +41 2018 AMC 10A Problems/Problem 9 →Solution 2
• 13:3613:36, 6 August 2021 diff hist +96 2018 AMC 10A Problems/Problem 9 →Solution 2
• 13:3313:33, 6 August 2021 diff hist +83 2018 AMC 10A Problems/Problem 9 →Solution 2
• 13:1213:12, 6 August 2021 diff hist +5 2018 AMC 10A Problems/Problem 8 →Solution 3
• 13:1213:12, 6 August 2021 diff hist +24 2018 AMC 10A Problems/Problem 8 →Solution 3
• 13:1113:11, 6 August 2021 diff hist −8 2018 AMC 10A Problems/Problem 8 →Solution 3
• 13:1113:11, 6 August 2021 diff hist +46 2018 AMC 10A Problems/Problem 8 →Solution 3
• 13:0913:09, 6 August 2021 diff hist +16 2018 AMC 10A Problems/Problem 7 →Solution
• 13:0913:09, 6 August 2021 diff hist −2 2018 AMC 10A Problems/Problem 7 →Solution
• 13:0613:06, 6 August 2021 diff hist −17 2018 AMC 10A Problems/Problem 6 →Solution 3
• 13:0513:05, 6 August 2021 diff hist −10 2018 AMC 10A Problems/Problem 6 →Solution 3
• 13:0413:04, 6 August 2021 diff hist +37 2018 AMC 10A Problems/Problem 6 →Solution 4
• 13:0413:04, 6 August 2021 diff hist +14 2018 AMC 10A Problems/Problem 6 →Solution 4
• 12:5712:57, 6 August 2021 diff hist +39 2018 AMC 10A Problems/Problem 4 →Solution 2

4 August 2021

• 15:3815:38, 4 August 2021 diff hist +3 2018 AMC 10A Problems/Problem 3 →Solution
• 15:3715:37, 4 August 2021 diff hist −1 2018 AMC 10A Problems/Problem 3 →Solution

30 July 2021

• 14:5014:50, 30 July 2021 diff hist 0 2017 AMC 10B Problems/Problem 23 →Solution 3 (Clever way using divisibility rules)
• 14:4914:49, 30 July 2021 diff hist +4 2017 AMC 10B Problems/Problem 22 →Solution 3

29 July 2021

• 15:2115:21, 29 July 2021 diff hist +9 2017 AMC 10B Problems/Problem 15 →Solution 5
• 15:2015:20, 29 July 2021 diff hist +17 2017 AMC 10B Problems/Problem 15 →Solution 4
• 15:1915:19, 29 July 2021 diff hist +4 2017 AMC 10B Problems/Problem 15 →Solution 4

26 July 2021

• 07:4007:40, 26 July 2021 diff hist +3 2017 AMC 10B Problems/Problem 12 →Solution 3

25 July 2021

• 16:2316:23, 25 July 2021 diff hist −1 2017 AMC 10B Problems/Problem 9 →Solution 2 (complementary counting)
• 16:1716:17, 25 July 2021 diff hist −5 2017 AMC 10B Problems/Problem 8 →Solution 3

24 July 2021

• 16:1616:16, 24 July 2021 diff hist −2 2017 AMC 10A Problems/Problem 25 →Solution 1
• 16:1516:15, 24 July 2021 diff hist +13 2017 AMC 10A Problems/Problem 25 →Solution 1
• 16:1416:14, 24 July 2021 diff hist +58 2017 AMC 10A Problems/Problem 25 →Solution 1