Two-step chance: lists, tables and trees
Grade 7 Math Worksheet - Building Confidence
Circle the best answer, or write your answer on the line.
Tala flips a fair coin and rolls a fair number cube (a busy afternoon). How many outcomes are in the list for both?
Zee picks one of 4 shirts and one of 5 hats for picture day, and every pair is allowed. How many different outfits are possible?
Ari flips a fair coin and spins a spinner with 5 equal parts. How many outcomes are in the list for both?
H1, H2 ✓, H3, H4 ✓, T1, T2, T3, T4. Bo flips a fair coin and spins a spinner with 4 equal parts numbered 1 to 4. The checked cells show heads with an even number. What is the chance of that, in simplest form?
HH ✓, HT ✓, TH ✓, TT. Jun flips a fair coin twice (the coin does not mind). The checked cells show at least one head. What is the chance of that, in simplest form?
Read this first
Tree
The first spinner splits into star and moon; each of those splits into 1, 2, 3 and 4. Leaves: star-1 ✓, star-2, star-3 ✓, star-4, moon-1, moon-2, moon-3, moon-4.
Milo spins two spinners with equal parts: one star/moon, one numbered 1 to 4. The checked branches show a star and an odd number. What is the chance of that, in simplest form?
Noah flips a fair coin three times. The checked branches show exactly one head. What is the chance of that, in simplest form?
Ren flips a fair coin twice. Which is the whole list of outcomes for the two flips?
- HH, TT
- H, T
- HH, HT, TT
- HH, HT, TH, TT
Tala spins two spinners, each with 2 equal parts: red (R) and blue (B). Which is the whole list of outcomes for both spinners?
- RR, BB
- RR, RB, BB
- R, B
- RR, RB, BR, BB
Ari spins a spinner with 3 equal parts (A, B, C), then one with 2 equal parts (1, 2). Which is the whole list of outcomes for both?
- A, B, C, 1, 2
- A1, A2, B1, B2, C1, C2
- A1, A2, B1, B2, C1, C2, D1
- A1, B2, C1