Library / UKMT Junior Mathematical Challenge /24 of 274

UKMT Junior Mathematical Challenge, 2021

Number theory Difficulty 1.0 Junior Find the answer United Kingdom

How many of the following numbers are multiples of 11? $187 \quad 156 \quad 253 \quad 495 \quad 132$

(A) $1$ (B) $2$ (C) $3$ (D) $4$ (E) $5$

We don't reproduce this publisher's solutions. Their own solution is here — work the problem first.

Want a route through all this instead of an archive? The track puts 2,604 problems in a working order, from Junior Challenge level to the IMO shortlist.

Source: UK Mathematics Trust, licensed © UK Mathematics Trust; past papers published free at ukmt.org.uk. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.