Webinars SET B - Grade 3-4 - Sunday@3:15-4:15pm EST-Recording Webinar 11

Video Transcription

Video Summary

This final Level 3 Math Kangaroo webinar (Winter 2026) focuses on “finding missing values” using algebraic thinking, reasoning, and flexible strategies rather than one fixed method. The instructor begins with a warm-up: two baskets each have 12 apples; after a sequence of removals, the total remaining is always 12, explained via variables or a sample number.<br /><br />Several contest-style problems are solved using underlining key information, polls, and multiple approaches. Highlights include: a grasshopper jumping +3 steps or −2 steps (net adjustments) needs 12 jumps to land on step 22; cutting some of 9 papers into three pieces increases the total to 15, meaning 3 papers were cut (each cut adds 2 pieces); an ice cream price is found from being $0.80 short for four servings but having $0.30 left after buying three, giving $1.10 per serving. A sleep-duration problem uses time intervals, leading to 11 hours 5 minutes. A sibling-count problem is modeled with a Venn diagram: of 29 students, 3 have no siblings, so 26 have siblings; with 12 having sisters and 18 having brothers, 4 must have both.<br /><br />A harder money problem uses equality and totals to find Witek has 5 zloty. A year problem concludes Maggie was born in 1988. Abhinav solves a 5-day hiking arithmetic sequence problem; Thursday’s distance is 16 km.<br /><br />The session ends with test-week advice: practice timed tests, review mistakes, skip and return to hard questions, recheck using different methods, fill bubbles carefully, rest well, and consider available tools and a feedback survey/raffle.

Keywords

Math Kangaroo Level 3

Winter 2026 webinar

finding missing values

algebraic thinking

contest math strategies

grasshopper jumps problem

paper cutting pieces problem

ice cream price word problem

Venn diagram siblings problem

arithmetic sequence hiking distances