Place Value - estimate the calculation, round off first to decode a joke.

Round each number to one significant figure first, then calculate to make an estimate of the calculation to decode the joke. Devices within the puzzle allow students to self monitor their work and correct errors. Students like to finish a puzzle, but they don’t always like the jokes they decode! The puzzle also supports literacy students have to split the string of letters into recognisable words to work out the answer (answers included).

Key words: Estimation, estimate, place value, significant figure, joke, decode. round, significant figure, estimating, rounding, worksheet, joke, (unlock, untangle, understand).