Subtraction

Tynnu ar linell rhif
Subtraction on a number line

Tynnu 1 wrth rhif hyd at 20
Taking 1 away from a number to 20

Tynnu 2 neu 3 wrth rhif hyd at 20
Taking 2 or 3 away from a number to 20

Lluosrif o 10 - 10
Multiple of 10 - 10

Lluosrif o 10 - Lluosrif o 10
Multiple of 10 - Multiple of 10

2 ddigid - 1 digid
2 digits - 1 digit

Adnabod y lluosrif nesaf o 10
Spotting the next multiple of 10

Adnabod y naid i'r lluosrif nesaf o 10
Knowing the gap to the next multiple of 10

Adnabod y naid dros lluosrif o 10
Knowing the total gap across a multiple of 10