Question 12
Emma adds $1+2+3+4+\cdots$ on a calculator. She accidentally omits one number and obtains $305$. Which number did she miss?
SEAMO 2016 — Paper B — Grade 3–4 Question 12
SEAMO · SEAMO 2016 — Paper B — Grade 3–4
SEAMO · SEAMO 2016 — Paper B — Grade 3–4