Differentiating students' learning needs in primary mathematics classrooms is an issue faced by many teachers. One technique designed to differentiate the level of challenge in mathematics tasks is the use of enabling prompts and extending prompts. We report on survey data pertaining to enabling and extending prompts, and teacher noticing of 37 Year 3 to 6 teachers participating in a project investigating the use of challenging tasks. Data were coded and categorised using grounded theory. The teachers valued enabling and extending prompts when implementing challenging mathematical tasks, and using these prompts stimulated them to notice students' reasoning and mathematical communication.