decimal practice makes perfect (1)

a ppt is here

• addition and subtraction
• multiplication
• division

decimal sequences

the powerpoint has some examples of counting up and down in constant decimal steps

these are intended to be done orally - class chanting

(fairly easily checked)

decimal addition

an attempt to suggest a lesson (sequence) with sections involving

• teaching or reviewing a skill
• practice of that skill in tasks that involve generalisation and possibly proof

a ppt is here

for the initial task (finding change from £10 or $10) students can be taught to make the first digits up to 9 and then the last one to 10 (unless it's zero)

they can speed up....

maybe for homework or extra work

nearest to

six digits

I think there are 20 pairs of results that are 0.09 apart (i.e quite close together)

times by powers of ten

what other relations must there be between the digits?

what number must b + c be more than? why?
what number must  a + b + c be less than? why?

the powerpoint is here