Number bonds to 10 and 20: boring but useful practice sheets, progressing from simplest onwards

Use for homework or for a quick in-class mental arithmetic starter/refresher/test. If used repeatedly, children can try to beat their previous scores and times.
Should be suitable from about Year 2 onwards and for remedial use in upper KS2 or even KS3: give these to anybody you see counting on their fingers.
Header on each page shows LI (learning intention); edit the headers to LO, WALT or your school's preferred jargon.