Search every subject world, from Preschool to Grade 12. The first five courses of every subject path are free.
13 courses
Mathematics · Kindergarten
Every teen number is a full ten and some more ones. Children build teen numbers with ten strips and blocks, write equations like 14 = 10 + 4, see why the 1 in a teen numeral stands for ten ones, and use 'ten and some more' to compare and order teen numbers.
Mathematics · Grade 1
First graders extend counting past 100 to 120 from any starting number, read and write numerals such as 104 and 117 correctly, count large collections by making tens, and compare numbers with the symbols >, < and =.
Mathematics · Grade 1
Ten ones bundled together make a ten. Learners build and write two-digit numbers as tens and ones, compare two-digit numbers by looking at the tens first, and find 10 more and 10 less than a number without counting, using base-ten blocks and the hundred chart.
Mathematics · Grade 1
Learners solve joining and putting-together stories within 20, including stories where the missing number is the part that was added. They add by counting on from the greater number, and use turn-around facts and smart grouping (make a ten first) to add two or three numbers.
Mathematics · Grade 1
Subtraction is more than taking away. Learners solve take-from stories, take-apart stories where one part is missing, and compare stories that ask how many more or fewer, all within 20. They learn to solve subtraction by thinking of a missing addend and choosing between counting back and counting up.
Mathematics · Grade 1
Learners build reliable strategies for facts within 20: making a ten to add (8 + 6 = 8 + 2 + 4), going back through ten to subtract (13 − 4 = 13 − 3 − 1), using doubles and near doubles, and using fact families so every addition fact also gives two subtraction facts. Facts within 10 are practised for accuracy, never against a clock.
Mathematics · Grade 1
The equal sign means 'is the same amount as', not 'the answer comes next'. Learners decide whether equations such as 7 = 8 − 1 and 4 + 1 = 5 + 2 are true or false, find unknown numbers in any position (5 = ☐ − 3), and balance equations with operations on both sides (4 + 5 = 3 + ☐).
Mathematics · Grade 1
Learners add within 100 using base-ten blocks, the hundred chart and number lines: adding tens to a two-digit number (34 + 20), adding ones with and without making a new ten (42 + 5 and 47 + 6), and explaining their steps in tens and ones while solving story problems.
Mathematics · Grade 1
Seventy take away thirty is like seven take away three, but with tens. Learners subtract multiples of ten from 10 to 90 using ten-sticks and number-line jumps, use addition to subtract by counting up in tens, and solve story problems with tens, including differences of zero.
Mathematics · Grade 1
How long is it? Learners order objects by length, compare two lengths that cannot be put side by side by using a string as a go-between, and measure lengths by laying same-size units such as cubes end to end with no gaps or overlaps. They learn to spot measuring mistakes and explain why they change the answer.
Mathematics · Grade 1
Learners tell and write time to the hour and half hour on analog and digital clocks: the short hand shows the hour, the long hand shows the minutes, and half past means the long hand has gone halfway around. They then put the events of a day in time order and find one hour later.
Mathematics · Grade 1
A class asks a question, collects answers and turns them into a table, a picture graph and a bar graph. Learners organize data into up to three categories, show it in a graph, and answer questions about how many are in each category, how many in all, and how many more or fewer one category has than another.
Mathematics · Grade 1
What makes a triangle a triangle? Learners separate defining attributes (three straight sides, closed) from attributes that do not matter (colour, size, direction), build new shapes from flat and solid shapes, and split circles and rectangles into two and four equal shares called halves and fourths, discovering that more equal shares means smaller shares.
