Adding and taking away · Usually met around P1
Two-digit adding and taking away
From “Two-digit adding, no carrying” to “Column addition and subtraction”, step by step, each skill with its methods, worked examples and answers.
Skills in this topic, easy to hard
- Two-digit adding, no carryingTens with tens, ones with ones
- Adding and subtracting tensOnes stay put: just add or take the tens
- Two-digit addition with regroupingLeft to right: tens first, then ones
- Adding three numbersFind two that make 10 first
- Two-digit taking away, no exchangingTens, then ones; check by adding
- Two-digit subtraction with regroupingTake the tens first, then the ones
- Column addition and subtractionOnes under ones; start from the ones