Game: FOUR IN A ROW
Aim: To get four symbols in a row
Method:
Choose a square and click on it. Click on the correct answer to the question in the box that appears. If you are right the square is replaced by a tick. Continue until you have won 4 in a row...
5th grade / Add + Subtract / Subtract 89, 99, 109 / Subtract 99 from multiple of 10
When you subtract from a large number, you can sometimes use simple tricks to help you. This is especially so when the number to be subtracted has a unit value of 1 or 9.
When subtracting 99, it is often easier to first subtrat 100, and then subtract 1 more to get the answer.
130 - 99 = (130 - 100) + 1 = 30 + 1
Of course, this trick also works when the initial number is not a multiple of 10:
137 - 99 = (137 - 100) + 1 = 37 + 1
You can use a similar technique whenever the number to be subtracted has a unit value of 9 (or 1 in which case you subtract 1 rather than add as the second step).
With our Four in a row math game you will be practicing the topic "Subtract 99 from multiple of 10" from 5th grade / Add + Subtract / Subtract 89, 99, 109. The math in this game consists of 28 questions that ask you to subtract 99 from a number by first subtracting 100 and then adding 1 to the result.
The game will reinforce the math you have chosen to learn by getting you to match the question to the correct answer.
Notes
UXO * Duck shoot * The frog flies * Pong * Cat and mouse * The beetle and the bee
Rock fall * Four in a row * Sow grow * Choose or lose * Mix and match
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