Add and subtract multiples of 10, like 30 + 40 and 80 - 50.
This is a mixed review
It mixes several skills on one sheet, which is good for revision. To practise one skill at a time, choose:
What the worksheets look like
Easy
Start here: the simplest problems.
Medium
Bigger numbers and more steps.
Hard
The toughest problems and word problems.
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Practice this with a game
Same skill, more fun: earn stars and beat your best score.