Mark This One

Grades 2–5 · Doing the Work · Page 1 of 2

Name Date
DIRECTIONS: Robin marked this sheet. Mark it again, properly: tick or cross. Not everything odd is wrong.
The questionWhat Robin wroteTick or cross
1.72 − 6666 → 69 is 3, 69 → 72 is 3, so 6
2.47 + 3976
3.61 − 1961 − 20 = 41, then + 1 = 42
4.Add 9 and 7, then take away 3.16
5.32 − 2715
6.32 + 2759
7.There were 16 stickers in a box. 5 were given away. How many are left?21
8.48 − 2226
9.42 + 2024 + 20 = 44
At the bottom of Robin’s sheet, in Robin’s writing: “I marked it myself. 8 out of 9.”
  1. What is Robin’s real score, out of 9?  

Mark This One — What Robin Did

Grades 2–5 · Doing the Work · Page 2 of 2

DIRECTIONS: Say what Robin did, not just that it is wrong.
B. For each one you crossed, write its number and what Robin did.
  1. Two of Robin’s right answers were worked out in a way you would not use. Find one. Write its number, and say whether it is still right.
  2. Robin gave themselves 8 out of 9. You gave them fewer. Robin was not cheating — so what makes your own work the hardest kind to mark?
C. Three of your own. Do them, then mark them yourself against the key.
  1. Add 11 and 8, then take away 5.  
  2. There were 14 stickers in a box. 7 were given away. How many are left?  
  3. 38 + 48