Ink-saving
White cards with coloured borders and the animals in colour. For every animal rescued, your child colours in a star.
Download PDFAddition and subtraction to 100
Adding and subtracting within 100 is the big topic in Year 2 in the UK and Grade 2 in the US. This free worksheet practises it with 32 problems, with and without crossing a ten, for example 34 + 25, 47 + 18, 76 − 30 and 63 − 27. Eight animals are stuck in the vines, and every right answer helps to set them free. Print it as a PDF, no sign-up needed.
Colouring version
Black and white for any printer. Once an animal is rescued, your child gets to colour it in.
Download PDFFree for home and the classroom. Licence: CC BY-NC 4.0, so feel free to print, copy and pass it on, just don't sell it. If you share the sheet online, please link to this page. CC BY-NC 4.0
How the worksheet works
- Each of the eight animals has three problems to work out and one gate problem, just like in the game: out of three answers, your child circles the right one.
- When all four problems are right, the animal is rescued: in the ink-saving version your child colours in its star, in the colouring version the whole animal.
- There is no answer key on purpose: check the answers together, or let your child check with the inverse calculation (8 − 3 = 5, so 5 + 3 = 8).
Tricks for adding and subtracting to 100
Partition: tens first, then ones
34 + 25 = 54 + 5 = 59Split the second number: add 20 first, then 5.
Bridge to the next ten
47 + 8 = 47 + 3 + 5 = 55Just like to 20: first up to the next whole ten, then the rest.
Subtract in steps
63 − 27 = 43 − 7 = 36Take away the tens first, then the ones, bridging back through a ten if needed.
Multiples of ten are easy
76 − 30 = 4640 + 35 = 75With whole tens, only the tens digit changes.
Round and adjust with 9 and 19
45 + 19 = 45 + 20 − 1 = 64Adding 19 is adding 20 and taking away one. That saves crossing a ten.
Count up instead of taking away
82 − 78 = 4, because 78 + 4 = 82When both numbers are close together, finding the difference is much quicker.
Common mistakes
- 46 + 8 = 44↔46 + 8 = 54
When crossing a ten, the tens digit does not go up.
What helps: 46 + 4 = 50, then 4 more: 54.
- 52 − 7 = 55↔52 − 7 = 45
The ones are subtracted the wrong way round: 7 − 2 instead of 2 − 7.
What helps: First take away 2 to get to 50, then 5 more: 45.
- 34 + 5 = 84
The 5 gets added to the tens instead of the ones.
What helps: Ones go with ones: 4 + 5 = 9, so 39. Showing it on a hundred square helps.
For teachers
The sheet mixes problems with and without crossing a ten, so it works as practice in Year 2 / Grade 2 and for revision in Year 3 / Grade 3. The colouring version prints on any black-and-white photocopier, and the ink-saving version needs very little colour.
Rather practise with a game?
In Number Jungle your child runs through the jungle and dashes through the gate with the right answer. The same problems, matched to their school year, with no ads and offline. Free for Android, iPhone and iPad.
More about the game →FAQ
Which year group is this worksheet for?
From Year 2 in the UK and Grade 2 in the US, when numbers to 100 come up, and for revision in the years after that.
Is the worksheet really free?
Yes. It is free, with no sign-up and no email address. You may print and copy it for home and for the classroom.
Is there an answer key?
No, on purpose. The inverse calculation is a good check: if your child worked out 8 − 3 = 5, they can check it with 5 + 3 = 8. For the gate problems, the right answer is one of the choices anyway.
What is the difference between the two versions?
The ink-saving version has animals in colour and a star to colour in. The colouring version is completely black and white, and the rescued animal itself gets coloured in.
How can my child keep practising addition and subtraction to 100?
Short, frequent practice helps most. For example with the free game Number Jungle: facts that are still wobbly come up more often until they stick.