Numbers to 1,000: 2nd grade math in Oman

Hundreds, tens and ones, skip counting, number names, comparing numbers, patterns, odd and even.

Ride over tall orange dunes, splash in green wadis, and watch sea turtles come ashore under the stars. Characters here greet you with “Marhaba!” (hello in Arabic), and eggs hatch into hybrids of animals like Arabian oryx, dromedary camel, green sea turtle and ghost crab.

What your child practices

Follows Number & Operations in Base Ten — Place Value (2.NBT.A).

• Hundreds, tens and ones

  Build numbers to 1,000 from hundreds, tens and ones, and find what each digit is worth.

  2.NBT.A.1

• Skip counting by 5s, 10s and 100s

  Skip count by 5s, 10s and 100s to count planks, bags and more.

  2.NBT.A.2

• Number names to 1,000

  Read and write numbers to 1,000 in numerals and in words.

  2.NBT.A.3

• Comparing and ordering numbers

  Find which number is greater, use <, = and >, and put numbers to 1,000 in order.

  2.NBT.A.4

• Number patterns

  Find 10 or 100 more or less, and fill in number patterns.

  2.NBT.B.8

• Odd and even

  Tell odd from even numbers, and split even numbers into two equal parts.

  2.OA.C.3

Try a problem from Oman

Every problem is a short story set in the world. These are real problems from the game. Kids get endless new ones with different numbers.

Common mistakes, and how to help

Every wrong answer in Mixmonde is planned: it points to a named mistake, and the tip after a miss explains it with that problem’s numbers. These are the mistakes this world watches for, grouped the way the grown-ups’ dashboard shows them.

• Place value

  The digits are right but their places are not: a 3 in the tens is worth 30, not 3. This shows up when carrying, borrowing, lining up numbers or placing a decimal point.

  Mistakes we catch: mixed up the places, missing placeholder zero, wrote each part separately, digit instead of its value, miscounted places, counted a hundred as one ten, did not change the next place, mixed up tens and ones, mixed up teen and -ty, compares first digits only, compares later digits, same digits means equal and wrong step size.

  Try at home: Make bundles of 10 with straws or pencils and a rubber band. Build numbers like 34 (3 bundles, 4 loose) and swap a bundle for 10 loose ones when you need to take some away.

• Reading the question

  The math works, but the answer is to a different question: a number already given, a halfway step, or only part of a two-step problem.

  Mistakes we catch: counted meters, not planks.

  Try at home: Read the question aloud together and ask “what are we trying to find?” before solving. Point at the question part of the sentence.

• Counting and sequences

  Losing track while counting: off by one, skipping or double-counting, or counting the wrong things (fence posts instead of gaps).

  Mistakes we catch: counted the zero, wrong step size and checked the wrong digit.

  Try at home: Count objects by touching or moving each one into a pile. Count on from a number other than 1 (“start at 8 and count 5 more”), and count back too.

• Order and direction

  The right idea done the wrong way round: taking the smaller digit from the bigger one, dividing backwards, swapping x and y, or flipping more and less.

  Mistakes we catch: symbol backwards, ordered the wrong way and went the wrong way.

  Try at home: Use “more” and “fewer” in everyday talk: which plate has more grapes, how many fewer? Line things up side by side to compare.

• Choosing the operation

  The arithmetic is fine, but the wrong operation was picked: adding when the story takes away, or multiplying when it shares out.

  Mistakes we catch: doubled instead of halved and took away 2.

  Try at home: Act out word problems with toys: “3 birds, 2 fly away.” Ask “are we putting together or taking away?” before any numbers.

More Grade 2 worlds: Adding & Subtracting to 1,000 · Multiplication & Division · Fractions · Measuring & Graphs · Time, Money & Shapes