Give Me a Random Math Problem – Operations, 5 Sizes

What these flashcards ask

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The questions are made fresh for every run, 20 at a time. Every answer is a whole number of zero or more: a subtraction never goes below zero and a division always comes out even.

Numbers	Operation	Made from	Example	Different questions
Up to 10	Addition	numbers from 1 to 10	10 + 1 = 11	100
Up to 10	Subtraction	numbers from 1 to 10	10 − 1 = 9	55
Up to 10	Multiplication	numbers from 1 to 10	10 × 1 = 10	100
Up to 10	Division	answers and divisors from 1 to 10	100 ÷ 10 = 10	100
Up to 20	Addition	numbers from 1 to 20	20 + 1 = 21	400
Up to 20	Subtraction	numbers from 1 to 20	20 − 1 = 19	210
Up to 20	Multiplication	numbers from 1 to 12	12 × 1 = 12	144
Up to 20	Division	answers and divisors from 1 to 12	144 ÷ 12 = 12	144
Up to 50	Addition	numbers from 1 to 50	50 + 1 = 51	2,500
Up to 50	Subtraction	numbers from 1 to 50	50 − 1 = 49	1,275
Up to 50	Multiplication	numbers from 1 to 12	12 × 1 = 12	144
Up to 50	Division	answers and divisors from 1 to 12	144 ÷ 12 = 12	144
Up to 100	Addition	numbers from 1 to 100	100 + 1 = 101	10,000
Up to 100	Subtraction	numbers from 1 to 100	100 − 1 = 99	5,050
Up to 100	Multiplication	numbers from 1 to 12	12 × 1 = 12	144
Up to 100	Division	answers and divisors from 1 to 12	144 ÷ 12 = 12	144
Up to 999	Addition	numbers from 1 to 999	999 + 1 = 1000	998,001
Up to 999	Subtraction	numbers from 1 to 999	999 − 1 = 998	499,500
Up to 999	Multiplication	numbers from 1 to 12	12 × 1 = 12	144
Up to 999	Division	answers and divisors from 1 to 12	144 ÷ 12 = 12	144

Twelve sample questions with answers

3 × 8 = 24
14 + 8 = 22
9 ÷ 9 = 1
12 − 8 = 4
5 × 1 = 5
22 ÷ 2 = 11
5 × 4 = 20
60 ÷ 5 = 12
12 ÷ 6 = 2
40 ÷ 8 = 5
8 ÷ 8 = 1
1 + 13 = 14

How it works

Say give me a random math problem and one is already on the screen. Switch the four operations on or off, pick how big the numbers get, type your answer and press Enter. New questions deals 20 more.

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Set the size before you start

Under Numbers, Up to 10, 20, 50, 100 or 999 sets the largest number in an addition or a subtraction. Multiplication and division use factors from 1 to 12 at every size but Up to 10, which stops at 10 × 10.

What the problems look like

Every answer is a whole number. Division is built backwards from a multiplication fact, so 56 ÷ 7 comes out at exactly 8. Subtraction puts the larger number first, so no answer is negative. No problem comes twice in a round.

After each answer

Correct or Not quite appears with the answer, and Next brings another problem. After 20, a table lists every problem beside what you typed. Your best streak is kept in this browser only.

Open a lesson with five problems on the board. Pupils write each answer on a mini whiteboard and hold it up before you type it.
Two players can share one device and take turns. A wrong answer ends the streak and passes the keyboard.
A wrong answer is worth a pause. Have the child say the whole fact aloud, 6 × 8 = 48, before moving on.

Questions and answers

What kinds of math problems can it give me?

Whole-number arithmetic in four operations. Addition and subtraction use numbers up to 10, 20, 50, 100 or 999. Multiplication and division use factors up to 12. There are no fractions, decimals, negative numbers, algebra or word problems.

Does it check my answer?

Yes. Type a number and press Enter or Check. A right answer adds 1 to your streak. A wrong one shows Not quite with the correct answer and sets the streak back to 0. Your best streak is remembered in this browser.

Which level suits which grade?

As a rough guide, addition and subtraction up to 10 suit kindergarten and early first grade, up to 20 first and second grade, and up to 100 second and third. Multiplication and division usually start in third grade. Schools differ, so go by the child.

Can I use it on the classroom board?

Yes. Press Flip, and Show answer reveals each answer with no typing. Read the problem aloud, give the class a few seconds, then show it. There is no timer, so you set the pace. The page asks for no names.